True Torque Fluid Couplings

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True Torque™ Fluid Couplings
Economical soft starts, with smooth acceleration. Shock-load protection

From underground & overland belt conveyors to crusher and mixing applications, equipment professionals are constantly seeking better technology to protect critical production systems against the effects of damaging shock loads. And when it comes to eliminating sudden/jarring starts, or preventing system failure/deterioration due to overloads, nothing outperforms the system-saving capability of Falk True Torque fluid couplings.
• Unmatched, cushioned soft start flexibility, at an economical price point. Smooth acceleration.
• Mechanical overload protection.
• NEW sizes 2760HF & 2870HF offer higher capacity at higher speeds
• Increased starting torque available from standard NEMA B motors with a fluid coupling.

This is a benefit not offered by electronic soft start solutions.
Extended

• Proven reliability in demanding applications.
• No contacting surfaces to wear out … virtually no maintenance.

Providing the softest, smoothest start will maximize the life of your system components.
As the smart alternative to expensive & complicated electronic solutions, Falk True Torque fluid cou­plings allow precise adjustment of startup characteristics in the field, simply by changing the fluid fill level via the easy access fill & drain holes.
• NEW Longer starting profiles and softer starts
• For Sizes 1420HF & larger, adjustable metering orifices regulate the passage of fluid from the delay fill chamber into the working circuit, further softening the start.
• For sophisticated belt conveyors, consider Type HFDD. The extended delay fill chamber permits initial start factor as low as 40% of the full load torque, dramatically reducing shock & stretch to the belt at startup.

Use of the extended delay fill chamber (HFDD) is recommended for conveyors subjected to unloaded starts, those with concave sections, those with low inertia, or those with any combination of these conditions. Modest fill in the working circuit at startup minimizes belt liftoff, and assures unloaded & low inertia conveyors are not rapidly accelerated. Protection - regardless of load condition.

Torque applied to a belt conveyor starts at zero (point C) and gradually increases in magnitude as the coupling impeller accelerates to point D. When the output torque of the fluid cou­pling exceeds the breakaway start­ing torque of the belt conveyor (point D), the conveyor gradually & smoothly accelerates to full speed.
Prevent jamming overloads that can cut short the life of your system.

True Torque fluid couplings safeguard your system against mechanical overload. Simple, straightforward protection when instantaneous jams are encountered.

• Two fusible plugs per coupling, are a standard feature, and pre­vent damage to the driven equipment and the motor.
• The proximity sensor cutout switch accessory, an extra charge option, prevents fluid discharge, and provides ability to reset cutouts in case of frequent overloads (see page 12).
• Another optional accessory, the easily replaceable thermal trip plug, is used in conjunction with a trip switch, also prevent­ing fluid discha rge (see page 12).

Increase the starting torque available
for hard starting conditions.

Over-sizing of electric motors for the purpose of increased starting torque can be avoid­ed with a properly selected fluid coupling. A fluid coupling allows the motor to accelerate independently to full speed,
HFDD Starting Profile

the driven load has been isolated by the fluid coupling. Once the motor is started, the fluid coupling gradually introduces the driven load. If the starting load is high, the breakdown torque (Point B) of the energized motor is now available for starting purposes.

Easily balance the load sharing between multiple drives.
Adjust the fill so each motor carries an equal burden.

Complete drive systems from Falk

But Falk’s capability isn’t limited to just selling a component, we sell drive systems incorporating the gear drives, couplings, backstops, brakes, guards & motors, all mounted on a bedplate, swing base or alignment free assembly.
Plus, our ready availability keeps you producing… even in the most remote places on Earth.
Fluid Coupling Solutions to suit any need.

The gear coupling mounting arrangement (HF20) features economy, ready availability from stock components, and permits convenient drop-in/drop-out servicing.

Basic Types
The non-delay fill option (HFN/HFR) provides soft start, including a short delay (example: 5-10 seconds) in the acceleration of the load, and is a good choice when overload

protection or increased starting torque is a primary requirement.

The sheave mounting arrangement (HF41) is designed for use with V-belt or synchronous belt connections.

Selection Guide 521-110 June 2004

Table of Contents
BenefitsofaFluidCoupling................6-7

MountingArrangements...................8

BasicTypes.........................9

PrinciplesofOperation................. 10-11

Accessories ......................12-13

HowtoSelect.......................14

FluidCouplingIdentification................15

AvailabilityTable......................15

QuickSelectionTables................. 16-21

HF20GearCouplingMount .............. 22-23

HF31, 31-1, 32, & 32-1 Steelflex/Hollow Shaft Mount . 24-25

HF25DiscCouplingMount ................26

HF132 & 132-1 Tschan/Hollow Shaft Mount ........27

HF41Sheave/ShaftMount ............... 28-31

EngineeringData .....................31

RecommendedFluids ...................32

Basic Information

Safety Notes
Install and operate Falk products in conformance with applicable local and national safety codes and per Falk installation manuals which are shipped with fluid couplings and are also available upon request. Suitable guards for rotating members may be purchased from Falk as optional accessories. Consult your local Falk district office for complete details.
People Conveying Equipment Selection of Falk products for applications whose primary purpose is the transportation of people is not approved. This includes such applications as freight or passenger elevators, escalators, man lift platforms, and ski tows and ski lifts.

If the primary purpose of the application is material conveyance and occasionally people are transported, the Falk warranty may remain in effect provided the design load conditions are not exceeded and certification to the appropriate safety codes and load conditions has been obtained by the system designer or end user from the appropriate enforcement authorities.

Speed Variation of Multi-Speed Applications – Fluid couplings offered in this selection guide are designed to operate on single speed applications, i.e. the motor driving the fluid coupling is started, accelerates to its base speed, and is not subject to speed variation about its base speed. The operating characteristics of a fluid coupling (a centrifugal device) are dependent on the speed of the coupling, and in particular, reduction in speed from those conditions identified in the selection tables will cause diminishing performance. All variable speed or multi-speed applications should be referred to Falk to determine whether a fluid coupling is suitable for the application.

Warranty — The warranty period for Fluid Couplings is 1.5 years from date of shipment. The description of what is covered by this warranty is found in Falk’s General Conditions & Terms/Standard Conditions of Sale.

F AL K

Benefits of using a Falk fluid coupling

Soft cushioned starts
Without the fluid coupling, the motor instantly transmits its locked rotor torque (starting torque) to the driven machine (point A at right). Then, it quickly reaches and applies the breakdown torque (point B). For common applications, locked rotor and breakdown torque often approximates 200% or more, of the motor nameplate rating.
Damage can result if the required break-away starting torque of the driven machine is significantly less, the machine will be abruptly accelerated to rated speed.
With a fluid coupling installed, however, the torque to the driven machine starts at zero (point C) and gradually increases as the coupling impeller accelerates to point D.
When the output torque of the fluid coupling exceeds the break-away starting torque of the driven machine (point D), the driven machinery gradually accelerates (right half of chart). As the machine comes up to rated speed, the slip of the fluid coupling decreases to (point E) and uniform power is transmitted at maximum efficiency.

Increased starting torque
With a fluid coupling, the breakdown torque of a standard NEMA B squirrel cage motor can be used to provide additional torque to start the machinery.
In this example of a high horsepower application, the NEMA B motor will initially exert only 80% of its rated torque (point A). Only if the motor can accelerate to 85% of its synchronous speed can it take advantage of its 175% breakdown torque (point B).

However, with a properly selected fluid coupling, the motor can start under no load (point C), and reach its breakdown torque in only a few shaft revolutions.
If a fluid coupling is not utilized, an oversized motor or a special high starting torque motor may be required. These solutions are costly, and introduce undesirable variables into the system. A properly selected and filled Falk fluid coupling can provide an initial starting torque ideally matched to the needs of the driven machine. Attainable initial starting torque values range from 40% of normal running load minimum, up to a maximum initial starting torque value that equals the full breakdown torque of the motor.

Overload protection
When a machine jams, the life of individual components may be drastically reduced. Without overload protection, the stored energy of the machine is absorbed in the first second following the jam, increasing stresses on components to many times their normal running values.

The fluid coupling slip characteristics spreads the absorption of the impact over a period of time, reducing stress on the components and therefore, protecting your machinery.
B

200 T 200 A
O
R
Q
U
E

100 E 100%
MACHINE RESISTIVE TORQUE
C
0 20 40 60 80 100

MACHINE SPEED %

MOTOR ACCELERATION MACHINE ACCELERATION
250
200
B
T
O 150

R
Q
U
E

100
A

% 50

C
0 20 40 60 80 100
MOTOR SPEED %

10
T O

9 R
8Q U 7
E
6

M A 5

G

N4 I T3
U D

2 E
1 NORMAL RUNNING LOAD

0 1234 56 TIME-SECONDS
6 (521-110) © The Falk Corporation, 1982, 2004.

Reduced current draw when starting
The electric current draw at startup is dramatically reduced when a fluid coupling is present. The motor starts without any meaningful load yet applied by the driven machinery (point A, Figure 1). In the absence of load, the motor quickly accelerates to approximately 90% of its full load speed (point B, Figure 1). The result is that low current draw (point C, Figure 1) is achieved within several shaft revolutions. At this point the inertia of the motor has been accelerated, and the application of load from the driven machine will not cause subsequent periods of high inrush current.

With a fluid coupling, the duration of high current draw is reduced substantially as shown in the shaded area of Figure 2. This results in electrical savings and extended service life of the motor.

Accessories provide non-discharging protection against overload (Page 12)
If a jam occurs without a fluid coupling, the motor will stall, and draw over 500% of full load current (point A), and possibly burn out. Furthermore, mechanical impact forces of even greater magnitude can be generated which can damage the driven machine.

With a properly selected Falk fluid coupling, the motor speed will lug down only to the intersection of the motor torque and 100% slip curve of the fluid coupling (point B). Therefore, the current draw of the motor will only rise to point C. If the overload or blockage is removed, the drive will resume its normal torque and speed. If not removed, the coupling fluid temperature will rise, causing the fusible plug to melt. This disconnects the torque from the driven machine. In lieu of fusible plug, consider proximity sensor cutout switch, or non-discharging thermal trip plug and thermal trip switch. See page 12 for details.

Load balancing for multiple drives
Loads can be easily balanced on multiple drive systems when fluid couplings are installed at each motor. Refer to the illustration at the right, two motors, each equipped with a fluid coupling. Load sharing between the two motors has been achieved by appropriately adding fluid to one coupling, or withdrawing fluid from the other coupling.

As an added benefit, motors on multiple drive systems can be individually started because of the ability of one coupling to temporarily operate at 100% slip. Starting one motor at a time provides extended and even softer starts on multiple drive conveyors. Since the motors are started as separate events, the system maximum inrush current will be approximately half the system maximum inrush current experienced when both motors are started simultaneously.

Load dampening
Fluid coupling dampens shock and vibratory load to maximize equipment life.

Figure 1
600
M
O
T
O

500
R
C U 400 R R E N
300 T
&
200
T O R
100
Q U E
A % MOTOR SPEED %

Figure 2

M O 600
T O R
500
C U R 400
R E N T
300
& 200
T O R
100
Q U E
%

M
O
T
O
R

C
U
R
R
E
N
T

&

T
O
R
Q
U
E

%

600 A 500 400 300 200 100
MOTOR SPEED %
100,000 lb-in.

F AL K

Mounting Arrangements

Gear Coupling Mount
Type HF20 (Exposed Bolt)
Most Economical
Drop-in/drop-out servicing (no need to move connected equipment)
Available Sizes 185-1660
Readily shipped from stock components

Steelflex/Hollow Shaft Mount
Type HF31 (Setscrew Retention) Type HF32 (Keeper Plate Retention)
For limited shaft gaps/Steelflex grid coupling at driving end
Hollow shaft bored to the order
Type HF31/available Sizes 320-1480/secured to driven shaft with (2) setscrews/allow clearance for setscrew wrench
Type HF32/available Sizes 320-1760 & 2760/secured to driven shaft with keeper plate & retention fastener/drill & tap driven shaft end for retention fastener
Excellent performance @ high power & high rpm

Disc Coupling Mount
Type HF25
Non-lubricated, low maintenance, long life
Drop-in/drop-out servicing (no need to move connected
equipment)
Available Sizes 370-2870
Excellent performance @high power & high rpm

Page 27

Tschan/Hollow Shaft Mount
Type HF132
For minimum shaft gaps/Tschan elastomer coupling at driving end
Non-lubricated, low maintenance
Hollow shaft bored to the order
Available Sizes 370-1760 & 2760/secured to driven shaft with keeper plate & retention fastener/drill & tap driven shaft end for retention fastener
Excellent performance @ high power & high rpm

Sheave/Hollow Shaft Mount
Type HF41
For V-Belt connections
Mounted on motor shaft
Sizes 185-370/QD sheave by purchaser/standard hollow shaft collet with draw bolt by Falk
Size 1420/special sheave by Falk/standard hollow shaft collet with draw bolt by Falk
Sizes 1480-1584/special sheave by Falk/hollow shaft bored to the order/secured to motor shaft with keeper plate & retention fastener/drill & tap motor shaft end for retention fastener
Follow manufacturer’s recommendations when tensioning V-Belts

8 (521-110) © The Falk Corporation, 1982, 2004.

Basic Types

Non Delay Fill (HFN) and Inactive Delay Fill (HFR)
Soft, cushioned start with a short delay in the acceleration of the load (Example: 5 seconds)
Satisfactory soft start for many common applications
Best choice for overload protection (Page 6)
Good choice for increased starting torque (Page 6)
All fluid remains in the working circuit
HFR (plugged delay fill chamber) furnished when HFN not available
RUNNER IMPELLER
DRIVING
DRIVEN
END

END

Delay Fill (HFD)
Softer, more cushioned start with longer delay in the acceleration of the load (Example: 12 seconds)
Excellent choice for belt conveyors, and other applications calling for sophisticated soft start
Incorporates delay fill chamber
At start, the working circuit has reduced fill. Fluid from the delay chamber is metered into the working circuit during acceleration.
Provides overload protection

Extended Delay Fill (HFDD)
Softest, most cushioned start of empty belt conveyors. Longest delay in the acceleration of the load (Example: 20 seconds)
Superior choice for high end belt conveyors, low inertia applications, and starting of empty belts
Incorporates extended (enlarged) delay fill chamber
At start, the working circuit has least fill. Fluid from the extended delay chamber is metered into the working circuit during acceleration.

Choosing the right basic type:
Information above, along with the Quick Selection Tables, enable you to choose the most appropriate basic type of fluid coupling. Where required, Falk can provide engineered fluid coupling selections based on the demand HP and WR2 of your mechanical system.
Fluid does the work
At start-up centrifugal force and impeller vane action pump the

working fluid against the runner, building torque and speed to match the motor capabilities with the driven machine requirements.
Standard Features
1-1500 HP capacity
No contacting surfaces to wear out
Efficiencies to 99%
Bolted (not welded) construction for simple rebuilds
High temperature Viton seals for long life
Internal baffles for soft starts and stalls
2 fusible overload plugs
140°C/200°C for maximum protection
Fill angle finder makes setup easy
Externally changeable metering orifices (1420 & larger)
Standard delay chambers (370 & larger)
Extended delay chambers (370 & larger)
F AL K

Principles of Operation
Introduction
The working circuit is defined by the Casing, Impeller, and Runner. A conical baffle is attached to the Impeller, and a flat baffle is attached to the Runner. The Impeller and Runner each represent half of a hollow torus, each with flat radial vanes. Torque transfer takes place as follow.
Driving End (Input) mechanically transfers torque to the Casing.
Casing mechanically transfers toque to the Impeller.
Impeller transfers torque, via the Fluid, to the Runner.
Runner mechanically transfers torque to the Shaft.
Shaft mechanically transfers torque to the Driven End (Output).
The Runner has no mechanical connection to the Impeller, these

two components are connected by the energized Fluid. If you
rotate the Driving End (Input) by hand, the Driven End (Output)
does not rotate.

Fluid couplings are furnished without fluid. Customer supplied
fluid is added during installation.

Starting
Standard NEMA B motors are recommended when using fluid couplings and will start virtually unloaded. Since the motor is mechanically connected to the impeller and casing, the low inertia of these components and the fluid are the only loads imposed. As the electric motor accelerates to running speed, the impeller begins to centrifugally pump fluid to the stationary runner. Initial dispersion of fluid is de-concentrated by the conical impeller baffle, producing a gradual increase in torque, allowing the motor to accelerate rapidly to full running speed. When all the fluid is pumped into the working circuit, continuous circulation of fluid will occur between the impeller and runner. A flow path is formed, shaped like a helical coil that is joined into a closed ring.

As soon as the transmitted torque reaches the value of the load breakaway torque, the runner starts rotating and accelerates the driven load. The time required to reach full speed is dependent on the inertia of the driven load, the resistive torque, and the torque being transmitted by the fluid coupling.

Running
The operation of a fluid coupling is based on hydrokinetic principles and requires that the output speed be less than the input. This difference in speed is called slip. Further, this principle provides that the output torque is equivalent to the input torque. Therefore, efficiency equals 100% minus the percent of slip.

At full running speed fluid couplings will normally slip between 1% and 4%. The fluid circulation between the impeller and runner has formed a helical coil at the outside circumference of the working circuit and is no longer de-concentrated by the conical baffle.

DRIVING
DRIVEN

END
END

(INPUT)
(OUTPUT)

AT REST
STARTING

RUNNING

10 (521-110) © The Falk Corporation, 1982, 2004.
Falk offers delay fill (HFD) and extended delay fill (HFDD). These
Overload – stall
Should the load torque increase, the slip will increase, which causes the runner to drop in speed. The coil of fluid circulating between the impeller and runner will expand to provide additional torque. The extent to which this coil can expand is limited by the flat baffle on the runner. Consequently fluid couplings provide inherent overload protection.
If the increase in torque causes the fluid in the working circuit to expand to the point of contacting the baffle, the coupling will stall and slip will be 100%. This continuous high slip generates heat and the fluid temperature will rise unless the overload is removed. When the temperature rises to the temperature limit of the fusible plug, the core of the plug will melt, releasing fluid from the coupling and effectively disconnecting power to the output shaft. To prevent the discharge of fluid, the use of a proximity cutout switch or thermal trip plug and limit switch is recommended, see Page 12.

Coupling guards must be designed to permit the free flow of air for cooling the fluid coupling, and to contain fluid discharge from fusible plug(s) in the event of a sustained overload. Consider Falk Orange Peel coupling guards, which are ideally suited for this purpose.

Belt conveyors – superior soft start
Delay fill (HFD) and extended delay fill (HFDD)

The starting torque that can be transmitted by a fluid coupling is a function of the amount of fluid in the working circuit at start. The delay fill chamber with metering orifice option, bolted to the driving end of Sizes 1420HF thru 2870HF fluid couplings, permits a portion of the fluid to drain out of the working circuit, and into the delay chamber, when the coupling is at rest. This reduction of fluid in the working circuit at startup provides an ideal method to assure superior soft start for belt conveyors, and is effective for starting belts that are loaded or unloaded.
Upon starting, and once the electric motor has accelerated the fluid coupling to appreciable speed, the fluid in the delay chamber is slowly metered into the working circuit by virtue of the
(3) metering orifice plugs shown below, gradually increasing the transmitted torque. The time required to completely empty the delay chamber can range from 15 to 60 seconds.
TYPE HFD DELAY FILL

solutions provide longer, softer starts, while providing higher efficiencies at full operating speeds.
NORMAL RUNNING CONDITION
FLUID FLOW
ABOVE BAFFLES

DRIVER

DRIVEN 1775
1750 RPM RPM

INCEPTION OF OVERLOAD/STALL
FLUID FLOW DROPS CONTACTING BAFFLES AND REDUCING TORQUE
DRIVER

DRIVEN 1775
0
RPM
RPM

TYPE HFDD EXTENDED DELAY FILL
CHAMBER

SIZES 1420 & LARGER TYPES HFD & HFDD
METERING ORIFICES DETERMINE FLOW RATE FROM FILL CHAMBER TO WORKING CIRCUIT
EXTERNAL ACCESS PLUG
(3) EQUALLY SPACED

REPLACEABLE METERING ORIFICE
(3) EQUALLY SPACED

F AL K

Accessories For Overload Protection and

Prevention of Fluid Discharge
Proximity Sensor Cutout Switch
The actual speed of the driven shaft is continuously compared to
the pre-set cutout speed. The switch includes an adjustable speed
control box for manual setting of the cutout speed, usually 80% of normal operating speed. During overload, the instant the 2 SENSOR TARGETS SENSOR TARGET
driven shaft speed drops below the cutout speed, the cutout AT 180°
switch opens the motor starter circuit, disconnecting the motor electrical supply. To start the system after the overload is removed, press the start DRIVEN SHAFT AIR GAP .090” -.120” 1.00”
button and hold it until the driven shaft speed exceeds the cutout
speed. If the overload has NOT been removed, the starter circuit
will again open and shut down the motor when the start button is released because the driven shaft did not exceed the cutout SENSOR JAM NUT
speed. Nothing needs to be replaced or repaired. HEAD
For Type HF20, the sensor target can be placed on the output half of the Falk gear coupling. For Types HF31, 31-1, 32 and 32-1, the SENSOR SUPPORT BRACKET
sensor target would be attached to a shaft on the output side of the fluid coupling. For the HF41, the sensor target would be attached to the end of the fluid coupling opposite the sheave. (FABRICATE TO SUIT BY PURCHASER)
For a full description of the proximity sensor cutout switch, see
Falk Service Manual 428-440.

Thermal Trip Plug & Thermal Trip Switch
Fluid discharge can be prevented by using an optional thermal trip plug in place of the standard fusible plug. When the fluid temperature exceeds a predetermined value, a pin extends to trip a limit switch and cut out the motor. Thermal trip plugs are available in temperatures of 140°C and 180°C. The drive can be reactivated by resetting the motor cut-out and replacing the trip plug. Note: For the Type HF41 sheave coupling design (or any reverse mounted fluid coupling), the thermal trip plug/limit switch prevents fluid discharge due to overheating caused by excessive slippage, where the coupling slows down, but does not stall. In
THERMAL TRIP PLUG
this case the trip plug will still rotate and trip the switch in the event of overheating. If the requirement is to trip a switch in the
SWITCH
event of a total jam in the system (outer case of fluid coupling at zero rpm & plug cannot rotate through switch), use proximity sensor cutout switch above. For a full description of the thermal trip plug and thermal trip switch, see Falk service manual 528-510.

Orange Peel® Coupling Guards
Falk Orange Peel Coupling Guards offer a convenient, economical enclosure for rotating couplings.
FLUID COUPLING SIZE Orange Peel Guard Selection ‡
185HF
CFCG30
235HF
CFCG40
270HF
CFCG40
320HF
CFCG50
370HF
CFCG50
1420HF -1660HF
See Orange Peel Selection Guide 111-310
>1660HF
Refer to Falk
‡ Review site conditions versus guard dimensions to assure proper clearances for guard are present.
Orange Peel Coupling Guard
12 (521-110) © The Falk Corporation, 1982, 2004.

Other Accessories

Falk angle finder (Part No. 1224653)
Each fluid coupling is shipped with an angle finder. Reorder in case of loss or damage. The Falk angle finder will ease the task of filling the fluid coupling to the specified fill angle. Setup time is reduced, because the Falk angle finder is direct-reading. Simply place the angle finder on the filler plug boss and rotate the coupling to the required fill angle.

Provide soft start plus holdback – or – Control the overrun tendencies of specific applications
Falk fluid coupling/disc brake package
Falk fluid coupling/disc brake packages are versatile designs that can be customized to meet your specific needs. The superior performance inherent in disc brakes, combined with the benefits of a fluid coupling, provide an ideal package for inclined conveyors where soft start and holdback are required for the process of moving loads from a lower elevation to a higher elevation. The package consists of a fluid coupling and a Type G63 coupling (Gear coupling with brake disc incorporated). The brake disc is designed to be compatible with hydraulic calipers that are actuated by a Falk supplied hydraulic power pack.

In the illustration below, the G63 mounting of the brake disc is shown. Note that application of the brake takes place at the output side of the fluid coupling. This arrangement assures that braking is applied directly to the driven shaft.

The use of a fluid coupling/brake disc package to retard overruning tendencies associated with specific applications, or to retard eccentric loads that wish to roll back to a neutral centered position, requires significant analysis and should be referred to Falk.
TYPE G63 – FLUID COUPLING WITH GEAR COUPLING AND BRAKE DISC

DRIVEN END (OUTPUT)
ALSO AVAILABLE IN NON-LUBRICATED
DISC COUPLING VERSION

(Type FD63)

F AL K

How to select

The Falk fluid coupling is a multiple use device:
Provide soft cushioned starts
Provide increased starting torque
Provide overload protection
Reduce current draw when starting
Provide load balancing for multiple drives
Provide load dampening

To achieve these objectives, use a standard NEMA B motor with sufficient breakdown torque to start the machinery and with adequate continuous rating for the normal continuous load. The function of the fluid coupling is to allow the motor to come up to speed with minimum load.

The fluid coupling is selected on the basis of the full load running horsepower as well as the torque required to start the load. In some applications, such as belt conveyors, it may be desirable to limit the maximum starting torque. If possible, select the coupling on the basis of the load rather than the motor rating, especially if the motor is oversized. Couplings that are selected on the basis of the motor size will have starting torque and maximum overload torques in relation to the motor rating.
Selection procedure
1.
Determine the running load horsepower (preferred) or the motor horsepower.

2.
Choose a Start Factor from the Table below. Start Factor: the ratio of a pertinent starting torque to the running load torque (the torque required to maintain the load (speed) once equipment has been accelerated to its design speed)

For Belt Conveyors (Select from Pages 16 & 17). Start Factor is the average starting torque exerted by the fluid coupling during load acceleration, expressed as a percent of running load torque. Page 17 (HFDD) also states initial start factor, which is the nominal torque applied at the inception of acceleration, expressed as a percent of running load torque. The low initial start factor (HFDD) assures an extra soft empty belt start on low inertia conveyors, yet is adequate to overcome the breakaway torque of the conveyor.
General Duty (Other than Belt Conveyors), select from Pages 18 thru 21, Start Factor is equivalent to the initial start factor mentioned in the paragraph above. For these General Duty applications, the initial start factor insures breakaway of the driven machinery.

Start Factor Table
Applications Start Factor Select From
Belt Conveyors 120% to 140% Pages 16-17

General Duty

Fans 140% Pages 18-21
Mixers 170% to 200% Pages 18-21
Crushers 250% Pages 18-21
Armored Face Conveyors Refer to Falk Refer to Falk

3. Refer to the Quick Selection Tables (Pages 16 thru 21). For Belt Conveyors, select HFN or HFD from Page 16. For
extra soft empty belt starts on low inertia belt conveyors,
consider HFDD selections on Page 17.
For General Duty (Other than Belt Conveyors), select HFD or

HFN/HFR from Pages 18 thru 21.
Note the percent slip and fill angle.

4.
Select a Mounting Arrangement (gear coupling, disc coupling, etc.) from Page 8.

5.
For coupling size, basic type, and mounting arrangement selected, see Availability Table, Page 15. Table indicates whether the selection is available, and if so, the allowable speed.

6.
If initial basic type and mounting arrangement not available, or insufficient allowable speed, consider alternative basic type/mounting arrangement.

7.
Check bore capacity of the coupling selected, dimension tables, Pages 22 thru 31.

Selection example:
1.
Belt Conveyor: Fluid coupling connects a motor to the input shaft of a gear drive. Motor is NEMA B, rated 100 HP at 1775 rpm. Running load = 98 HP. Motor shaft 2.875”, gear drive input shaft 2.250”.

2.
Start Factor 1.20 to 1.40, select from Pages 16 & 17 as appropriate (selections for Belt Conveyors).

3.
HFD selections for Belt Conveyors, Page 16. For 98 HP running load, select 370HFD, 4.1% slip, fill angle 63 degrees.

4.
Select 370HFD20 (Gear Coupling mount) from Page 8, economical, and includes drop-in/drop-out servicing.

5.
Availability Table Page 15, 370HFD20 is available, allowable speed is 1800 rpm, exceeds the requirement of 1775 rpm.

6.
Alternative basic type/mounting arrangements are listed on Page 15.

7.
Page 23, dimensions, max bore is 2.875”, which is adequate.

14 (521-110) © The Falk Corporation, 1982, 2004.

Fluid Coupling Identification

1420 HFD 20
SIZE
185
235
270
320
370 BASIC TYPE
1420 HFN = Non Delay Fill
1480 HFD = Delay Fill
1584

HFDD = Extended Delay Fill
1660
HFR = Inactive Delay Fill
1760
MOUNTING ARRANGEMENTS
With Falk G Gear Coupling: –10: Shrouded bolt design

20: Exposed bolt design
With Falk FD Disc Coupling:


25:
With Falk T Steelflex Coupling:


31: Thru bore with setscrew


31-1: Max bore with setscrew

HFNR = Reverse Mounted HFN (requires internal modifications) – 32: Thru bore with keeper plate
2760

HFDR = Reverse Mounted HFD (requires internal modifications) – 32-1: Max bore with keeper plate
2870

HFRR = Reverse Mounted HFR (requires internal modifications) With Tschan Coupling:

132: Thru bore with keeper plate


132-1: Maximum bore with keeper plate With Sheave:


41: Motor mounted with sheave at output


42: Driven shaft mounted with sheave at input (requires internal modifications)

Availability Table (by Basic Type & Mounting Arrangement)
(An Allowable Speed indicates that the fluid coupling Basic Type and Mounting Arrangement is available for the given size)
Basic Type Mounting Arrangement Coupling Size & Allowable Speed (rpm)
185 235 270 320 370 1420 1480 1584 1660 1760 2760 2870
Gear HFN 10 1800 1800 1800 1800 1800
Gear HFN 20 1800 1800 1800 1800 1800 1800 1800
Gear HFD 20 . . . . . . . . . . . . 1800 1800 1800 1500 1200
Gear HFDD 20 . . . . . . . . . . . . . . . 1800 1800 1500 1200
Gear HFR 20 . . . . . . . . . . . . . . . 1500 1200
Steelflex HFN 31 . . . . . . . . . 1800 . . .
Steelflex HFD 31, 31-1 . . . . . . . . . . . . 1800 1800 1800
Steelflex HFR 31, 31-1 . . . . . . . . . . . . 1800 1800 1800
Steelflex HFN 32, 32-1 . . . . . . . . . 1800
Steelflex HFD 32, 32-1 . . . . . . . . . . . . 1800 1800 1800 1800 1800 1500 1800
Steelflex HFR 32, 32-1 . . . . . . . . . . . . 1800 1800 1800 1800 1800 1500 1800
Disc HFN 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1500
Disc HFD 25 . . . . . . . . . . . . 1800 1800 1800 1800 1800 1500 1800 1500
Disc HFDD 25 . . . . . . . . . . . . . . . 1800 1800 1800 1800 1500 1800 1500
Disc HFR 25 . . . . . . . . . . . . 1800 1800 1800 1800 1800 1500 1800
Tschan Tschan Tschan HFD HFDD HFR 132, 132-1 132, 132-1 132, 132-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1800 ... 1800 1800 1800 1800 1800 1800 1800 1800 1800 1800 1800 1800 1800 1500 1500 1500 1800 1800 1800
Sheave Sheave HFN HFD 41 41 1800 . . . 1800 . . . 1800 . . . 1800 . . . 1800 1800 1800 1800 1800 1800 1800 1800

F AL K

HFN & HFD for Belt Conveyors *

Quick Selection Table 1775-870 rpm input speed
Load Horse­power STA RT FA CTOR 140% FOR BELT C ONV EYORS † Load Horse­power
1775RPM 1450RPM 1170 RPM 970 RPM 870 RPM
HFN & HFD HFN & HFD HFN & HFD HFN & HFD HFN & HFD
COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE
1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 6.25 7.50 8.75 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 35.0 40.0 45.0 50.0 185 185 185 185 185 185 185 235 235 235 235 235 235 270 270 270 270 270 320 320 320 320 320 320 5.0 4.9 5.0 5.0 4.7 4.7 5.4 4.7 5.1 4.6 4.4 4.8 5.6 3.2 3.9 4.4 5.7 7.0 3.5 3.2 3.0 3.7 4.2 5.1 85 81 78 76 74 70 65 81 78 75 71 68 65 71 68 65 62 59 75 72 70 67 65 62 185 185 185 185 185 235 235 235 235 235 270 270 270 270 320 320 320 320 320 4.4 4.5 5.1 6.0 7.1 4.9 4.5 5.0 5.2 6.5 3.3 4.0 4.8 7.4 3.2 3.3 3.8 4.4 5.4 75 71 67 63 60 79 76 72 67 61 69 66 64 59 72 69 66 64 62 185 235 235 235 235 235 235 270 270 270 320 320 320 320 6.6 4.9 4.8 4.4 5.0 4.8 6.1 3.3 4.4 6.8 3.3 3.1 3.7 4.9 61 80 77 75 73 68 64 69 65 60 73 70 67 63 235 235 235 235 235 270 270 320 320 320 320 4.2 4.7 5.1 6.1 6.6 3.8 4.5 3.2 3.2 4.0 5.1 75 71 68 63 60 68 64 75 71 66 63 235 235 270 270 270 270 320 320 320 4.9 7.5 3.0 3.9 4.2 6.3 3.3 3.6 4.7 70 65 70 67 65 60 74 68 64 1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 6.25 7.50 8.75 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 35.0 40.0 45.0 50.0
370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1584 2.7 2.8 3.0 3.4 4.4 3.0 3.1 3.7 4.1 4.6 2.8 3.0 3.2 3.7 4.3 2.6 83 77 72 68 61 75 70 66 62 59 77 74 69 65 62 88
370 370 370 370 1420 1420 1420 1420 1420 1420 1480 1480 1480 1480 2.7 2.8 3.0 3.6 2.6 2.8 3.0 3.1 3.5 3.8 2.7 2.8 3.1 3.2 83 79 72 66 81 77 73 70 67 64 80 76 73 69
370 370 370 370 370 370 1420 1420 1420 1420 1420 2.7 2.8 3.0 3.1 3.5 3.9 2.6 2.8 3.0 3.3 3.7 83 78 74 70 67 64 81 76 72 68 65
370 370 370 370 370 370 2.7 2.6 2.9 3.0 3.3 3.6 84 81 77 72 69 65
370 2.7 84
55.0 370 2.6 81 1420 2.6 82 1480 2.7 83 1480 3.6 66 1584 2.7 85 55.0
60.0 370 2.8 79 1420 2.7 79 1480 2.7 80 1584 2.7 92 1584 2.7 83 60.0
67.5 370 3.0 75 1420 2.9 76 1480 2.9 77 1584 2.5 89 1584 2.7 79 67.5
75.0 370 3.1 72 1420 3.0 72 1480 3.0 73 1584 2.6 86 1584 2.8 76 75.0
87.5 370 3.6 67 1420 3.5 68 1480 3.3 68 1584 2.6 82 1584 3.0 71 87.5
100.0 370 4.1 63 1480 2.7 84 1480 3.8 64 1584 2.8 78 1584 3.5 67 100.0
112.5 1420 2.8 79 1480 2.7 81 1584 2.4 89 1584 3.0 75 1584 4.6 61 112.5
125.0 1420 2.9 76 1480 2.8 77 1584 2.6 87 1584 3.0 71 1660 2.7 79 125.0
137.5 1420 3.0 72 1480 2.9 74 1584 2.8 85 1584 3.3 68 1660 2.8 76 137.5
150.0 1420 3.2 70 1480 3.1 72 1584 2.6 82 1584 3.7 66 1660 3.1 73 150.0
175.0 1420 3.7 65 1480 3.5 67 1584 2.8 77 1660 2.8 80 1660 3.3 69 175.0
200.0 1480 2.7 82 1584 2.6 91 1584 3.0 73 1660 2.9 76 1660 3.8 65 200.0
225.0 1480 2.8 78 1584 2.5 88 1584 3.2 69 1660 3.0 72 1660 4.2 61 225.0
250.0 1480 3.0 75 1584 2.7 86 1584 3.6 66 1660 3.3 69 1760 2.8 80 250.0
275.0 1480 3.1 72 1584 2.7 83 1660 2.6 82 1760 2.6 87 1760 2.9 77 275.0
300.0 1480 3.3 69 1584 2.7 81 1660 2.8 80 1760 2.8 85 1760 3.0 74 300.0
325.0 1584 2.6 93 1584 2.8 78 1660 2.8 77 1760 2.6 82 1760 3.0 71 325.0
350.0 1584 2.6 92 1584 2.9 76 1660 3.0 75 1760 2.7 80 1760 3.2 69 350.0
375.0 1584 2.7 91 1584 3.0 74 1660 3.1 73 1760 2.8 78 1760 3.5 67 375.0
400.0 1584 2.5 89 1584 3.1 72 1660 3.1 71 1760 2.8 76 1760 3.7 65 400.0
425.0 1584 2.6 88 1584 3.2 70 1660 3.3 69 1760 3.0 74 1760 4.0 63 425.0
450.0 1584 2.6 86 1660 2.6 86 1660 3.5 67 1760 3.0 72 2870 3.8 67 450.0
475.0 1584 2.8 85 1660 2.8 85 1660 3.6 65 1760 3.1 71 2870 3.8 66 475.0
500.0 1584 2.6 83 1660 2.8 84 1760 2.7 85 1760 3.2 69 2870 3.8 65 500.0
550.0 600.0 650.0 700.0 750.0 800.0 850.0 900.0 950.0 1000.0 1100.0 1200.0 1250.0 1584 1584 2.7 2.8 81 78 1660 1660 1760 1760 1760 1760 1760 1760 1760 2870 2870 2.7 2.8 2.7 2.6 2.6 2.4 2.6 2.7 2.7 4.0 3.6 81 78 94 92 91 89 88 87 85 84 81 1760 1760 1760 1760 1760 2870 2870 2870 *** 2.7 2.7 2.8 2.9 3.0 3.8 3.8 3.8 *** 83 80 78 75 73 74 73 72 *** ******** ******** ******** 2870 2870 2870 ** 3.9 4.0 4.3 ** 62 61 60 ** 550.0 600.0 650.0 700.0 750.0 800.0 850.0 900.0 950.0 1000.0 1100.0 1200.0 1250.0
1660 1660 1660 1660 2760 2760 2760 2760 2760 ‡ 2760 ‡ 2760 ‡ 2.7 2.4 2.6 2.5 2.3 2.4 2.4 2.6 2.3 2.3 2.2 92 90 89 86 99 98 97 97 94 92 91

* Selections above the BOLD line are HFN. Selections below the BOLD line are HFD.

For 1584HFD and 1660HFD in the shaded area, see Page 15 for Availability Table (by Basic Type and Mounting Arrangement). Choose a mounting arrangement with
adequate allowable speed for the application. †
Start Factor 140% for belt conveyors is the average starting torque exerted by the fluid coupling during load acceleration, expressed as a percent of running load torque. ‡
Based on 150% Start Factor.
* Refer to Falk.
16 (521-110) © The Falk Corporation, 1982, 2004.
HFDD for Belt Conveyors

Quick Selection Table 1775-1170 rpm input speed
Load Horse­power START FACTOR 120% FOR BELT CONVEYORS † Load Horse­power
1775 RPM 1450 RPM 1170 RPM
COUPLINGSIZE % SLIP FILL ANGLE INITIALSTART FACTOR
• COUPLINGSIZE % SLIP FILL ANGLE INITIALSTART FACTOR
• COUPLINGSIZE % SLIP FILL ANGLE INITIALSTART FACTOR
• 35.0 40.0 45.0 50.0 55.0 60.0 67.5 75.0 87.5 100.0 112.5 125.0 137.5 150.0 175.0 200.0 225.0 250.0 275.0 300.0 325.0 350.0 375.0 400.0 425.0 450.0 475.0 500.0 550.0 600.0 650.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1420 1420 1420 1420 1420 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 3.5 3.7 4.3 4.5 3.2 3.3 3.5 3.5 3.3 3.6 3.6 3.7 3.5 3.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 88 86 83 78 92 89 87 81 102 101 100 99 98 97 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.58 0.58 0.58 0.57 0.58 0.56 0.59 0.59 0.90 0.46 0.48 0.50 0.52 0.53 0.54 . . . . . . . . . . . . . . . . . . 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 . . . . . . . . . . . . . . . . . . 3.1 3.3 3.7 4.1 4.9 3.3 3.2 3.3 3.8 4.3 3.6 3.4 3.3 3.3 3.3 3.1 3.3 3.3 3.5 3.4 . . . . . . . . . . . . . . . . . . 91 90 86 83 81 94 91 88 85 81 99 98 96 95 93 90 88 86 85 80 . . . . . . . . . . . . . . . . . . 0.55 0.52 0.53 0.53 0.52 0.48 0.52 0.55 0.54 0.74 0.45 0.45 0.48 0.48 0.50 0.56 0.60 0.62 0.62 0.68 1420 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1660 1660 1660 1660 1760 1760 1760 1760 1760 3.2 3.5 3.8 4.1 4.8 5.0 3.2 3.4 3.8 4.3 5.0 3.3 3.3 3.3 3.3 3.4 3.7 4.0 4.5 4.5 3.3 3.3 3.4 3.5 3.7 3.7 3.4 3.3 3.2 3.2 3.2 91 89 86 84 82 80 92 89 85 82 78 98 96 94 91 88 83 80 77 72 90 88 86 84 82 79 99 97 95 93 92 0.60 0.55 0.54 0.54 0.53 0.52 0.58 0.56 0.59 0.60 0.60 0.49 0.48 0.48 0.58 0.58 0.66 0.66 0.66 0.72 0.62 0.61 0.60 0.61 0.67 0.70 0.43 0.53 0.56 0.58 0.57 35.0 40.0 45.0 50.0 55.0 60.0 67.5 75.0 87.5 100.0 112.5 125.0 137.5 150.0 175.0 200.0 225.0 250.0 275.0 300.0 325.0 350.0 375.0 400.0 425.0 450.0 475.0 500.0 550.0 600.0 650.0
1584 1584 1660 1660 3.2 3.3 3.1 3.3 96 95 103 102 0.55 0.56 0.50 0.53 1660 1660 1660 1660 1760 3.1 3.2 3.3 3.0 3.3 97 96 94 89 104 0.47 0.49 0.48 0.66 0.40
1660 2.9 100 0.53
700.0 1660 2.6 97 0.54 1760 3.3 103 0.40 1760 3.2 91 0.56 700.0
750.0 1660 2.6 95 0.55 1760 3.1 101 0.46 1760 3.2 90 0.55 750.0
800.0 1660 2.1 91 * 1760 3.0 100 0.50 2870 2.9 87 * 800.0
850.0 1660 2.2 90 * 1760 3.0 98 0.54 2870 3.0 86 * 850.0
900.0 1660 2.1 89 * 1760 3.0 97 0.55 2870 3.0 85 * 900.0
950.0 2760 2.0 102 * 2870 2.7 93 * 2870 3.1 84 * 950.0
1000.0 2760 1.4 100 * 2870 2.7 92 * 2870 3.2 83 * 1000.0
1100.0 2760 1.6 98 * 2870 2.7 91 * 2870 3.3 82 * 1100.0
1200.0 2760 1.5 96 * 2870 2.7 90 * 1200.0
1250.0 2760 1.4 95 * 2870 2.7 89 * 1250.0
1300.0 2870 2.7 89 * 1300.0
1400.0 2870 2.7 88 * 1400.0
1500.0 2870 2.7 86 * 1500.0

For 1584HFDD and 1660HFDD selections in the shaded area, see Page 15 for Availability Table (by Basic Type and Mounting Arrangement). Choose a mounting
arrangement with adequate allowable speed for the application. †
Start Factor 120% for belt conveyors is the average starting torque exerted by the fluid coupling during load acceleration, expressed as a percent of running load torque.
. Initial start factor for HFDD selections is the nominal torque applied at the inception of acceleration, expressed as a percent of running load torque. The low initial start factor assures an extra soft empty belt start on low inertia conveyors, yet is adequate to overcome the breakaway torque of the conveyor.
* Refer to Falk.
F AL K

General Duty (Other than Belt Conveyors)

Quick Selection Table 1775 rpm input speed
Load Horse­power GENERAL DUTY STAR T FAC TOR † Load Horse­power
140% 170% 200% 250%
HFD HFN/HFR* HFD HFN/HFR* HFD HFN/HFR* HFD HFN/HFR*
COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE
1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 6.25 7.50 8.75 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 35.0 40.0 45.0 50.0 55.0 60.0 67.5 75.0 87.5 100.0 112.5 125.0 137.5 150.0 175.0 200.0 225.0 250.0 275.0 300.0 325.0 350.0 375.0 400.0 425.0 450.0 475.0 500.0 550.0 600.0 650.0 700.0 750.0 800.0 850.0 370 370 370 370 370 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1660 1660 2.9 2.3 1.8 1.9 1.8 1.9 2.0 2.1 2.3 2.7 3.3 3.9 2.1 2.3 2.6 2.9 3.5 2.0 2.2 2.3 2.7 3.0 1.8 1.9 2.0 1.9 1.8 1.9 1.9 2.0 2.0 2.2 2.3 2.0 1.9 1.9 1.9 98 94 87 82 78 75 73 71 69 67 64 61 71 69 67 65 62 73 71 68 67 65 90 87 84 82 80 78 76 75 72 71 69 84 81 79 77 185 185 185 185 185 185 185 235 235 235 235 235 235 270 270 270 270 270 320 320 320 320 320 320 370 370 370 370 370 370 1420 1420 1420 1420 1420 1420 1480 1480 1480 6.7 5.9 6.2 5.3 5.2 5.5 6.4 5.6 5.8 4.7 5.2 5.1 6.6 3.2 3.7 4.3 5.7 7.0 3.5 3.2 3.0 3.7 4.2 5.1 3.3 3.4 3.2 3.3 4.0 4.7 3.3 3.2 3.3 3.8 4.0 5.1 3.3 3.2 3.4 88 82 80 76 75 71 67 81 79 75 72 69 67 71 67 64 62 59 75 72 70 67 65 62 75 73 71 69 67 64 74 71 69 67 65 62 73 71 68 370 370 370 370 370 370 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1584 1.7 1.3 1.4 1.3 1.5 1.5 1.6 1.7 1.9 2.3 2.6 3.1 3.4 1.9 2.2 2.4 2.8 3.2 3.6 1.9 2.3 2.5 2.8 3.0 1.4 94 89 86 80 76 73 70 69 67 65 63 60 56 67 65 63 62 58 54 67 65 63 61 59 80 185 185 185 185 185 185 185 235 235 235 235 235 235 235 270 270 270 270 320 320 320 320 320 320 320 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1584 1584 1584 4.6 4.0 3.7 3.3 3.4 4.0 4.6 4.2 3.7 3.5 3.6 4.3 4.7 5.6 3.2 3.9 4.6 4.8 2.5 2.6 2.8 3.3 3.8 4.4 4.8 2.6 2.7 3.1 3.4 4.2 4.7 2.7 3.1 3.3 3.7 4.4 2.5 2.8 3.2 3.4 5.4 4.9 3.7 84 79 76 73 71 67 62 80 76 72 69 66 62 50 63 60 57 52 70 68 66 64 61 58 55 69 67 65 63 60 56 67 65 63 62 58 69 67 65 63 85 82 80 370 370 370 370 370 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1480 1.1 1.2 1.0 1.1 1.2 1.2 1.4 1.6 1.8 2.1 2.5 2.6 1.6 1.8 2.1 2.3 2.5 2.7 1.6 1.9 2.1 2.4 2.5 2.7 2.6 87 83 80 75 72 70 67 66 64 62 60 55 66 64 62 60 58 52 66 64 62 60 57 55 50 185 185 185 185 185 185 185 235 235 235 235 235 235 270 270 270 320 320 320 320 320 320 320 320 370 370 370 370 370 370 1420 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1584 1584 3.1 2.6 2.4 2.6 2.7 3.2 3.7 2.9 2.5 2.6 2.8 3.2 3.7 2.6 2.9 3.3 2.1 2.1 2.3 2.5 2.6 2.9 3.3 3.4 2.2 2.4 2.6 2.8 3.1 3.4 2.3 2.6 2.7 2.9 3.2 3.4 2.4 2.7 2.8 3.1 3.2 2.7 1.8 80 76 73 71 68 63 55 77 73 69 65 61 55 64 60 56 71 69 67 65 63 60 57 52 67 66 64 62 60 55 66 64 62 60 58 52 66 64 62 60 57 77 75 370 370 370 370 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 0.8 0.9 0.9 0.9 1.0 1.2 1.3 1.5 1.7 1.8 1.8 1.2 1.4 1.7 1.8 1.8 1.1 1.3 1.5 1.7 1.8 1.8 0.9 0.9 0.9 79 76 74 70 67 65 63 61 60 56 51 65 62 60 57 53 67 64 62 59 56 51 73 71 70 185 185 185 185 185 185 235 235 235 235 235 270 270 270 270 320 320 320 320 320 320 320 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 1.8 1.8 1.7 1.9 2.1 2.4 2.0 1.7 1.7 1.9 2.2 1.8 2.0 2.1 2.3 1.6 1.7 2.0 2.1 2.2 2.2 2.3 1.7 1.9 2.0 2.1 2.2 2.2 2.2 1.9 2.1 2.2 2.3 2.3 1.7 2.0 2.1 2.2 2.3 2.2 1.4 1.5 1.6 76 73 69 66 63 53 78 73 69 64 58 66 64 59 53 69 67 65 63 61 59 53 67 65 63 61 60 56 51 65 62 60 57 53 67 64 62 59 56 51 73 71 70 1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 6.25 7.50 8.75 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 35.0 40.0 45.0 50.0 55.0 60.0 67.5 75.0 87.5 100.0 112.5 125.0 137.5 150.0 175.0 200.0 225.0 250.0 275.0 300.0 325.0 350.0 375.0 400.0 425.0 450.0 475.0 500.0 550.0 600.0 650.0 700.0 750.0 800.0 850.0
1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1.4 1.5 1.5 1.5 1.5 1.5 1.7 1.9 2.2 2.4 1.4 1.5 77 76 74 73 71 70 68 67 65 64 75 73 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1660 1660 3.3 3.1 2.4 2.5 2.6 2.4 2.6 2.8 3.1 2.9 2.4 2.4 77 76 74 73 71 70 68 67 78 ‡ 76 ‡ 75 73 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1.2 1.2 1.2 1.3 1.4 1.5 1.7 1.9 2.1 2.3 1.2 1.2 73 72 70 69 68 67 65 64 62 61 71 70 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1660 1660 1.9 2.1 2.0 2.1 2.1 2.2 2.5 2.7 1.8 1.9 2.1 2.1 73 72 70 69 68 67 65 64 75 73 71 70 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1.0 1.1 1.2 1.2 1.3 1.4 1.5 1.7 1.8 1.8 1.1 1.2 68 67 66 65 64 63 61 59 57 54 67 66 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1.6 1.7 1.8 1.9 2.0 2.1 2.1 2.2 2.3 2.3 1.8 1.9 68 67 66 65 64 63 61 59 57 54 67 66
1660 1.5 72 1660 1.3 69 1660 2.2 69 1660 1.2 64 1660 1.9 64
900.0 1660 1.9 75 1660 1.6 71 1660 1.4 68 1660 2.2 68 1660 1.3 63 1660 2.0 63 900.0
950.0 2760 2.7 99 2760 1.5 92 2760 1.3 85 2760 0.8 78 1660 2.1 62 950.0
1000.0 2760 2.8 98 2760 1.3 90 2760 1.2 83 2760 0.9 76 1000.0
1100.0 2760 2.3 94 2760 1.4 86 2760 1.0 80 2760 0.9 74 1100.0
1200.0 2760 1.8 90 2760 1.5 83 2760 1.2 77 2760 0.9 71 1200.0
1300.0 2760 1.9 87 2760 1.3 80 2760 1.1 75 2760 0.9 70 1300.0
1350.0 2760 2.0 85 2760 1.4 79 2760 1.1 74 2760 0.9 69 1350.0

For 1584HFD and 1660HFD selections in the shaded area, see Page 15 for Availability Table (by Basic Type and Mounting Arrangement). Choose a mounting arrangement
with adequate allowable speed for the application. †
Start Factor for General Duty (Other than Belt Conveyors) is the nominal torque applied at the inception of acceleration, expressed as a percent of running load torque.
* Sizes 185/235/270/320/2870 are HFN. Sizes 370/1420/1480 are HFN or HFR depending on mounting arrangement. Sizes 1584/1660/1760/2760 are HFR. ‡
175% Start Factor.
18 (521-110) © The Falk Corporation, 1982, 2004.
General Duty (Other than Belt Conveyors)

Quick Selection Table 1450 rpm input speed
Load Horse­power GENERAL DUTY S TART FAC TOR † Load Horse­power
140% 170% 200% 250%
HFD HFN/HFR* HFD HFN/HFR* HFD HFN/HFR* HFD HFN/HFR*
COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE
1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 6.25 7.50 8.75 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 35.0 40.0 45.0 50.0 55.0 60.0 67.5 75.0 87.5 100.0 112.5 125.0 137.5 150.0 175.0 200.0 225.0 250.0 275.0 300.0 325.0 350.0 375.0 400.0 425.0 450.0 475.0 500.0 550.0 600.0 650.0 700.0 370 370 370 370 370 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 2.9 2.0 1.9 1.8 1.9 1.9 2.0 2.2 2.6 3.1 3.5 4.0 2.1 2.2 2.6 3.2 3.8 2.0 2.1 2.4 2.7 3.3 3.9 1.9 1.9 2.0 2.0 2.1 2.2 2.5 2.7 2.9 3.1 98 91 86 81 78 75 73 70 67 65 63 61 72 69 67 64 62 72 70 68 67 64 61 81 77 75 72 71 69 68 67 65 64 185 185 185 185 185 235 235 235 235 270 270 270 270 270 320 320 320 320 320 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 5.5 5.9 5.6 7.4 7.1 5.5 6.3 5.6 5.7 3.5 3.3 4.1 4.7 7.4 3.2 3.3 3.8 4.4 5.4 3.4 3.4 3.1 3.8 4.2 5.1 3.4 3.4 3.2 3.8 4.4 3.3 3.2 3.0 3.5 4.0 4.6 7.3 4.8 4.3 3.5 3.2 3.2 3.2 3.6 3.6 3.9 2.8 76 72 69 65 60 80 78 73 69 73 69 66 63 59 72 69 66 64 62 75 73 70 67 65 63 74 72 69 67 64 75 72 70 68 67 64 83. 79. 77 75 72 71 69 68 65 ­77 ­75 ­ 370 370 370 370 370 370 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1660 1.3 1.5 1.4 1.4 1.5 1.6 1.7 2.1 2.5 2.9 3.2 3.5 3.5 2.2 2.4 3.0 3.4 3.6 2.0 2.3 2.5 3.1 3.4 3.6 1.5 1.5 1.7 1.9 2.2 2.4 2.6 2.8 3.0 3.0 1.5 1.7 1.9 89 83 79 75 73 71 69 66 63 61 59 56 51 65 63 60 57 52 66 65 63 60 56 50 72 70 68 67 65 64 63 62 61 59 70 68 67 185 185 185 185 185 235 235 235 235 270 270 270 270 270 320 320 320 320 320 320 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1660 3.7 3.7 4.3 4.7 5.6 3.7 3.4 3.5 4.2 2.6 3.1 3.5 4.1 4.8 2.6 3.1 3.5 4.0 4.6 4.7 2.6 3.0 3.3 3.8 4.5 4.8 4.7 3.0 3.3 3.9 4.7 4.9 2.8 3.2 3.4 4.2 3.3 2.5 2.5 2.4 2.6 2.8 3.0 3.2 3.4 2.4 2.5 2.6 73 69 65 60 53 77 74 69 64 68 65 62 59 51 68 65 63 60 58 54 69 66 63 61 59 56 51 65 63 60 57 52 66 65 63 60 78 75 72 70 68 67 65 64 63 74 73 72 370 370 370 370 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1.2 1.1 1.1 1.2 1.3 1.4 1.6 2.0 2.4 2.6 2.7 1.6 1.8 2.0 2.4 2.6 1.4 1.7 1.9 2.1 2.4 2.6 1.2 1.2 1.3 1.5 1.7 1.9 2.0 2.2 2.5 2.5 2.6 2.6 2.6 1.7 1.9 83 78 74 71 69 67 66 63 60 57 53 66 65 62 60 56 68 65 63 61 60 55 74 71 69 67 65 64 62 61 60 58 56 54 51 65 64 185 185 185 185 235 235 235 235 235 270 270 270 270 320 320 320 320 320 320 370 370 370 370 370 370 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 2.6 2.9 3.2 3.7 3.3 2.7 2.7 3.0 3.3 2.4 2.8 3.2 3.4 2.2 2.5 2.7 3.0 3.4 3.3 2.2 2.4 2.7 3.0 3.3 3.5 2.3 2.6 2.7 2.9 3.4 2.2 2.5 2.6 2.8 3.1 3.4 2.0 2.2 2.2 2.3 2.5 2.7 2.7 2.9 3.1 3.2 3.3 70 65 60 50 79 75 72 66 59 66 62 59 54 69 65 62 59 56 50 67 66 63 60 57 53 66 65 62 60 56 68 65 63 61 60 55 74 71 69 67 65 64 62 61 60 58 56 370 370 370 370 370 370 370 370 370 1420 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 0.9 0.9 0.9 1.1 1.2 1.3 1.5 1.7 1.8 1.2 1.3 1.4 1.6 1.8 1.8 1.2 1.3 1.5 1.7 1.8 1.8 0.9 1.0 1.1 1.2 1.4 1.5 1.6 1.8 1.8 1.8 1.1 1.2 76 72 69 67 65 63 61 58 53 66 64 62 60 57 53 66 63 61 59 56 51 72 69 66 64 63 61 59 57 55 51 66 65 185 185 235 235 235 235 235 235 270 270 270 320 320 320 320 320 320 370 370 370 370 370 370 1420 1420 1420 1420 1420 1420 1480 1480 1480 1480 1480 1480 1584 1584 1584 1584 1584 1584 1584 1584 1584 1584 1660 1660 1.9 2.2 2.3 2.0 1.8 1.7 1.8 2.1 1.9 2.1 2.3 1.5 1.7 1.9 2.2 2.3 2.2 1.7 1.9 2.0 2.1 2.2 2.3 1.9 2.0 2.1 2.1 2.2 2.3 1.8 2.0 2.1 2.2 2.3 2.2 1.6 1.7 1.8 1.9 2.1 2.1 2.2 2.2 2.3 2.2 1.8 1.9 65 58 80 77 75 71 67 59 66 61 57 71 69 64 61 57 50 67 65 63 61 58 53 66 64 62 60 57 53 66 63 61 59 56 51 72 69 66 64 63 61 59 57 55 51 66 65 1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 6.25 7.50 8.75 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 35.0 40.0 45.0 50.0 55.0 60.0 67.5 75.0 87.5 100.0 112.5 125.0 137.5 150.0 175.0 200.0 225.0 250.0 275.0 300.0 325.0 350.0 375.0 400.0 425.0 450.0 475.0 500.0 550.0 600.0 650.0 700.0
1660 1.9 76 1660 3.8 76 1660 1660 1660 1660 2.1 2.2 2.5 2.7 68 67 65 64 1660 1660 1660 1660 1.3 1.4 1.5 1.6 64 63 61 59 1660 1660 1660 1660 2.0 2.0 2.1 2.2 64 63 61 59
1660 1660 1660 1660 1660 2.0 2.1 2.1 2.3 2.5 75 73 71 69 68 1660 3.4 75 1660 1660 1660 1760 1760 2.4 2.6 2.8 4.0 3.6 70 68 67 81" 80
1660 1660 2.2 2.4 65 64 1660 2.0 62 1660 2.7 62 1660 1.8 57 1660 2.2 57
1660 2.3 61 1760 1.8 75 1660 1.8 54 1660 2.3 54
750.0 1760 2.0 85 1760 1.4 78 1760 3.4 78 1660 2.4 59 1760 2.0 74 1660 1.8 50 1660 2.2 50 750.0
800.0 1760 1.9 82 1760 1.5 76 1760 3.0 76 1760 1.2 72 1760 2.1 72 1760 1.0 67 1760 1.7 67 800.0
850.0 1760 1.8 80 1760 1.4 74 1760 2.4 74 1760 1.3 71 1760 2.2 71 1760 1.1 66 1760 1.8 66 850.0
900.0 1760 1.9 78 2870 3.4 83 1760 1.5 73 1760 2.4 73 1760 1.2 69 1760 2.1 69 1760 1.2 65 1760 1.9 65 900.0
950.0 1760 1.9 77 2870 3.4 83 1760 1.6 72 1760 2.6 72 1760 1.3 68 1760 2.1 68 1760 1.3 64 1760 2.0 64 950.0
1000.0 1760 1.9 75 2870 3.5 81 1760 1.6 71 2870 3.2 78 1760 1.4 67 1760 2.2 67 1760 1.3 63 1760 2.0 63 1000.0
1100.0 1760 2.0 73 2870 3.5 79 1760 1.7 69 2870 3.2 77 1760 1.6 66 1760 2.4 66 1760 1.5 61 1760 2.1 61 1100.0
1200.0 1760 2.1 71 2870 3.5 77 1760 1.9 67 2870 3.2 75 1760 1.8 64 2870 2.8 71 1760 1.6 59 1760 2.1 59 1200.0
1300.0 1400.0 1500.0
• ••
• ••
• ••
• ••
• ••
• ••
• ••
• ••
• •• 2870 3.2 75 1760 2870
• 2.0 2.9
• 62 60
• 2870 2870
• 2.8 2.8
• 70 69
• 1760 1760 2870 1.7 1.8 2.6 57 55 62 2870 2870 2870 2.4 2.4 2.4 66 64 63 1300.0 1400.0 1500.0
1600.0
• •
• •
• •
• •
• •
• • 2870 2.6 61 2870 2.4 61 1600.0
1700.0
• •
• •
• •
• •
• •
• •
• •
• •
• • 1700.0
1800.0 1800.0


• •
• •
• •
• •
• •
• Refer to footnotes on page 18. -155% Start Factor. . 145% Start Factor. " 175% Start Factor.

• Refer to Falk. © The Falk Corporation, 1982, 2004. (521-110) 19
F AL K

General Duty (Other than Belt Conveyors)

Quick Selection Table 1170 rpm input speed
Load Horse­power GENERAL DUTY START FACTOR † Load Horse­power
140% 170% 200% 250%
HFD HFN/HFR. HFD HFN/HFR. HFD HFN/HFR. HFD HFN/HFR.
COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE
1.00 235 6.0 86 235 4.1 82 235 3.0 79 235 2.0 76 1.00
1.25 235 5.9 80 235 3.9 78 235 2.9 76 235 1.7 72 1.25
1.50 235 6.3 79 235 3.4 75 235 2.4 72 235 1.8 68 1.50
1.75 235 4.7 75 235 3.7 73 235 2.6 70 235 1.9 65 1.75
2.00 235 5.3 74 235 3.3 70 235 2.9 67 235 2.1 61 2.00
2.50 235 5.3 70 235 4.3 66 235 3.2 61 270 1.8 66 2.50
3.00 235 7.0 66 235 4.5 60 235 3.7 51 270 2.0 63 3.00
4.00 270 3.3 69 270 3.1 65 270 2.8 62 270 2.2 56 4.00
5.00 270 4.3 64 270 3.9 60 270 3.3 56 320 1.6 69 5.00
6.25 270 6.9 60 270 4.8 54 320 2.1 69 320 1.9 65 6.25
7.50 370 2.9 100 320 3.3 73 370 1.4 91 320 2.5 69 370 1.3 85 320 2.4 66 370 0.8 77 320 2.1 62 7.50
8.75 370 2.2 93 320 3.1 70 370 1.6 85 320 2.9 66 370 1.1 79 320 2.7 63 370 0.9 73 320 2.2 58 8.75
10.0 370 1.9 88 320 3.7 67 370 1.3 80 320 3.3 64 370 1.1 75 320 2.9 60 370 0.9 70 320 2.4 54 10.0
12.5 370 1.8 79 320 4.9 63 370 1.5 74 320 4.3 59 370 1.2 70 320 3.5 54 370 1.2 66 370 1.8 66 12.5
15.0 370 2.0 74 370 3.3 74 370 1.6 70 320 4.7 52 370 1.5 67 370 2.3 67 370 1.4 62 370 2.0 62 15.0
17.5 370 2.2 71 370 3.2 71 370 1.9 67 370 2.8 67 370 1.9 64 370 2.7 64 370 1.7 59 370 2.2 59 17.5
20.0 370 2.4 68 370 3.6 68 370 2.3 64 370 3.2 64 370 2.2 61 370 2.8 61 370 1.8 55 370 2.3 55 20.0
22.5 370 2.9 66 370 4.1 66 370 2.7 62 370 3.6 62 370 2.4 58 370 3.1 58 1420 1.1 67 1420 1.8 67 22.5
25.0 370 3.3 64 370 4.6 64 370 3.1 60 370 4.2 60 370 2.6 55 370 3.4 55 1420 1.2 65 1420 1.9 65 25.0
27.5 370 3.8 62 1420 3.4 75 370 3.3 57 370 4.5 57 1420 1.5 67 1420 2.2 67 1420 1.4 63 1420 2.1 63 27.5
30.0 370 4.1 60 1420 3.5 73 370 3.5 54 370 4.7 54 1420 1.7 65 1420 2.5 65 1420 1.5 61 1420 2.1 61 30.0
35.0 1420 2.2 69 1420 3.1 69 1420 2.1 66 1420 3.0 66 1420 2.0 62 1420 2.7 62 1420 1.8 58 1420 2.3 58 35.0
40.0 1420 2.6 67 1420 3.9 67 1420 2.5 63 1420 3.3 63 1420 2.4 60 1420 3.0 60 1420 1.8 52 1420 2.3 52 40.0
45.0 1420 3.1 65 1420 4.3 65 1420 2.9 61 1420 3.9 61 1420 2.6 57 1420 3.4 57 1480 1.1 66 1480 1.8 66 45.0
50.0 1420 3.5 62 1420 5.1 62 1420 3.2 58 1420 4.4 58 1420 2.7 52 1420 3.4 52 1480 1.3 64 1480 1.9 64 50.0
55.0 1420 4.1 61 1480 3.3 74 1420 3.4 55 1420 4.6 55 1480 1.5 67 1480 2.3 67 1480 1.4 62 1480 2.0 62 55.0
60.0 1480 2.0 72 1480 3.3 72 1420 3.6 51 1420 4.8 51 1480 1.7 65 1480 2.5 65 1480 1.5 61 1480 2.2 61 60.0
67.5 1480 2.2 70 1480 3.1 70 1480 2.1 66 1480 2.9 66 1480 2.0 63 1480 2.7 63 1480 1.7 58 1480 2.2 58 67.5
75.0 1480 2.5 68 1480 3.8 68 1480 2.4 64 1480 3.3 64 1480 2.3 61 1480 2.9 61 1480 1.8 54 1480 2.3 54 75.0
87.5 1480 3.1 65 1480 4.3 65 1480 2.9 61 1480 3.9 61 1480 2.6 57 1480 3.3 57 1584 0.9 73 1584 1.5 73 87.5
100.0 1480 3.7 62 1480 5.4 62 1480 3.3 58 1480 4.7 58 1480 2.6 50 1480 3.3 50 1584 0.9 70 1584 1.6 70 100.0
112.5 1584 1.9 82 1584 7.6 82 1480 3.5 53 1480 4.8 53 1584 1.2 72 1584 2.1 72 1584 1.0 67 1584 1.7 67 112.5
125.0 1584 1.9 79 1584 5.5 79 1584 1.5 73 1584 2.4 73 1584 1.2 70 1584 2.1 70 1584 1.2 65 1584 1.8 65 125.0
137.5 1584 2.0 76 1584 3.9 76 1584 1.6 71 1584 2.6 71 1584 1.4 68 1584 2.2 68 1584 1.3 64 1584 2.0 64 137.5
150.0 1584 2.0 74 1584 3.4 74 1584 1.6 69 1584 2.5 69 1584 1.6 66 1584 2.3 66 1584 1.4 62 1584 2.1 62 150.0
175.0 1584 2.1 70 1584 3.0 70 1584 2.0 66 1584 2.8 66 1584 1.9 63 1584 2.6 63 1584 1.7 59 1584 2.2 59 175.0
200.0 1584 2.5 68 1584 3.8 68 1584 2.4 64 1584 3.3 64 1584 2.3 61 1584 2.9 61 1584 1.8 54 1584 2.3 54 200.0
225.0 1584 2.9 65 1584 4.0 65 1584 2.8 62 1584 3.7 62 1584 2.5 58 1584 3.2 58 1660 1.2 66 1660 1.8 66 225.0
250.0 1584 3.4 63 1584 4.7 63 1584 3.0 59 1584 4.2 59 1584 2.6 54 1584 3.4 54 1660 1.3 64 1660 2.0 64 250.0
275.0 1584 3.8 61 1660 3.4 74 1584 3.4 57 1584 4.8 57 1660 1.6 66 1660 2.3 66 1660 1.4 62 1660 2.1 62 275.0
300.0 1660 2.1 72 1660 3.3 72 1584 3.5 53 1660 2.7 68 1660 1.8 65 1660 2.6 65 1660 1.6 60 1660 2.1 60 300.0
325.0 1660 2.1 70 1660 3.1 70 1660 2.0 66 1660 2.9 66 1660 1.9 63 1660 2.7 63 1660 1.7 58 1660 2.2 58 325.0
350.0 1660 2.4 69 1660 3.4 69 1660 2.3 65 1660 3.1 65 1660 2.1 62 1660 2.8 62 1660 1.8 56 1660 2.2 56 350.0
375.0 1660 2.6 67 1660 3.7 67 1660 2.4 63 1660 3.2 63 1660 2.3 60 1660 2.9 60 1660 1.8 53 1660 2.3 53 375.0
400.0 1660 2.8 66 1660 4.0 66 1660 2.6 62 1660 3.5 62 1660 2.4 59 1660 3.1 59 1760 1.0 68 1760 1.6 68 400.0
425.0 1660 3.0 65 1660 4.0 63. 1660 2.9 61 1660 3.8 61 1660 2.5 57 1660 3.3 57 1760 1.1 67 1760 1.7 67 425.0
450.0 1660 3.3 64 1760 4.4 78. 1660 3.1 60 1760 2.4 74 1660 2.6 55 1660 3.4 55 1760 1.1 66 1760 1.8 66 450.0
475.0 1660 3.5 63 1760 5.0 78 1660 3.2 59 1760 2.4 73 1660 2.7 53 1660 3.5 53 1760 1.2 65 1760 1.9 65 475.0
500.0 1760 1.9 77 1760 4.5 77 1660 3.3 57 1760 2.6 72 1760 1.3 68 1760 2.1 68 1760 1.3 64 1760 2.0 64 500.0
550.0 1760 2.0 74 1760 3.3 74 1760 1.6 70 1760 2.5 70 1760 1.5 67 1760 2.3 67 1760 1.4 62 1760 2.0 62 550.0
600.0 1760 2.1 72 1760 3.3 72 1760 1.8 68 1760 2.6 68 1760 1.7 65 1760 2.6 65 1760 1.6 61 1760 2.2 61 600.0
650.0 1760 2.1 70 1760 3.0 70 1760 2.0 66 1760 2.8 66 1760 1.9 63 1760 2.6 63 1760 1.7 59 1760 2.2 59 650.0
700.0 1760 2.3 69 1760 3.3 69 1760 2.2 65 1760 3.1 65 1760 2.1 62 1760 2.8 62 1760 1.8 57 1760 2.3 57 700.0
750.0 1760 2.5 67 2870 3.7 74 1760 2.4 64 2870 3.5 73 1760 2.3 61 1760 3.0 61 1760 1.8 54 1760 2.3 54 750.0
800.0 1760 2.7 66 2870 3.7 73 1760 2.6 62 2870 3.4 70 1760 2.4 59 2870 3.0 67 1760 1.8 50 1760 2.2 50 800.0
850.0 2870 4.2 76 2870 3.7 72 1760 2.8 61 2870 3.4 70 1760 2.5 58 2870 3.0 66 2870 3.4 69 2870 2.5 60 850.0
900.0 . . . 2870 3.7 71 2870 3.9 73 2870 3.4 69 1760 2.6 56 2870 3.0 65 2870 3.3 66 2870 2.5 58 900.0
950.0 . . . 2870 3.8 70 2870 3.9 71 2870 3.3 67 2870 3.7 69 2870 3.0 64 2870 3.3 65 2870 2.5 56 950.0
1000.0 . . . 2870 3.8 69 . . . 2870 3.3 66 2870 3.7 68 2870 3.1 62 2870 3.2 62 2870 2.5 54 1000.0
1100.0 . . . . . . 2870 3.2 62 . . . 2870 3.1 60 2870 3.1 58 2870 2.7 50 1100.0
1200.0 . . . . . . . . . 2870 2.8 52 . . . 1200.0
1300.0 . . . . . . . . . . . . . . . 1300.0
1400.0 . . . . . . 1400.0
1500.0 . . . 1500.0


Start Factor for General Duty (Other than Belt Conveyors) is the nominal torque applied at the inception of acceleration, expressed as a percent of running load torque.
.
Sizes 185/235/270/320/2870 are HFN. Sizes 370/1420/1480 are HFN or HFR depending on mounting arrangement. Sizes 1584/1660/1760/2760 are HFR.

.
150% Start Factor.

.
Refer to Falk.

20 (521-110) © The Falk Corporation, 1982, 2004.
General Duty (Other than Belt Conveyors)

Quick Selection Table 870 rpm input speed
Load Horse­power GENERAL DUTY START FACTOR † Load Horse­power
140% 170% 200% 250%
HFD HFN/HFR. HFD HFN/HFR. HFD HFN/HFR. HFD HFN/HFR.
COUPLINGSIZE % SLIP FILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE% SLIP FILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE% SLIP FILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE COUPLINGSIZE% SLIPFILL ANGLE
1.00 235 4.9 70 235 4.1 66 235 3.2 62 235 2.3 50 1.00
1.25 235 7.5 65 235 4.7 60 235 3.7 50 270 2.1 63 1.25
1.50 270 3.0 70 270 2.8 67 270 2.7 64 270 2.2 59 1.50
1.75 270 3.9 67 270 3.3 64 270 2.9 60 270 2.3 54 1.75
2.00 270 4.2 65 270 3.8 61 270 3.3 57 320 1.6 70 2.00
2.50 270 6.3 60 270 4.7 55 320 2.1 70 320 1.9 66 2.50
3.00 320 3.3 74 370 1.6 93 320 2.5 70 370 1.1 86 320 2.3 66 370 0.8 78 320 2.1 62 3.00
4.00 370 1.8 89 320 3.6 68 370 1.4 81 320 3.2 64 370 1.2 76 320 2.9 61 370 0.9 71 320 2.3 55 4.00
5.00 370 1.8 80 320 4.7 64 370 1.5 75 320 4.2 60 370 1.3 71 320 3.4 55 370 1.1 66 370 1.8 66 5.00
6.25 370 2.0 74 370 3.4 74 370 1.6 69 320 4.9 52 370 1.6 66 370 2.3 66 370 1.4 62 370 2.1 62 6.25
7.50 370 2.2 70 370 3.1 70 370 2.0 66 370 2.9 66 370 2.0 63 370 2.7 63 370 1.7 58 370 2.2 58 7.50
8.75 370 2.7 67 370 4.0 67 370 2.5 63 370 3.4 63 370 2.4 60 370 3.0 60 370 1.8 52 370 2.3 52 8.75
10.0 370 3.2 64 370 4.4 64 370 3.0 60 370 3.9 60 370 2.6 56 370 3.3 56 1420 1.2 65 1420 1.9 65 10.0
12.5 370 4.2 60 1420 3.2 72 370 3.6 54 370 4.9 54 1420 1.7 65 1420 2.5 65 1420 1.5 61 1420 2.1 61 12.5
15.0 1420 2.4 69 1420 3.4 69 1420 2.3 65 1420 3.1 65 1420 2.1 62 1420 2.8 62 1420 1.8 56 1420 2.2 56 15.0
17.5 1420 2.9 66 1420 4.2 66 1420 2.7 62 1420 3.6 62 1420 2.4 58 1420 3.1 58 1480 1.0 67 1480 1.7 67 17.5
20.0 1420 3.4 63 1420 4.9 63 1420 3.1 59 1420 4.3 59 1420 2.7 54 1420 3.5 54 1480 1.2 65 1480 1.9 65 20.0
22.5 1420 4.0 61 1480 3.2 74 1420 3.5 56 1420 4.9 56 1480 1.5 67 1480 2.3 67 1480 1.4 62 1480 2.0 62 22.5
25.0 1480 2.1 72 1480 3.3 72 1480 1.8 68 1480 2.7 68 1480 1.8 65 1480 2.6 65 1480 1.6 60 1480 2.1 60 25.0
27.5 1480 2.2 70 1480 3.1 70 1480 2.0 66 1480 2.9 66 1480 2.0 63 1480 2.7 63 1480 1.7 58 1480 2.2 58 27.5
30.0 1480 2.4 68 1480 3.6 68 1480 2.3 64 1480 3.1 64 1480 2.2 61 1480 2.8 61 1480 1.8 55 1480 2.3 55 30.0
35.0 1480 3.0 65 1480 4.1 65 1480 2.8 61 1480 3.7 61 1480 2.5 58 1480 3.3 58 1584 0.8 73 1584 1.4 73 35.0
40.0 1480 3.6 63 1480 5.2 63 1480 3.2 58 1480 4.4 58 1480 2.6 52 1480 3.4 52 1584 0.9 70 1584 1.6 70 40.0
45.0 1480 4.1 60 1480 6.5 60 1480 3.6 55 1480 4.8 55 1584 1.2 73 1584 2.0 73 1584 1.0 68 1584 1.7 68 45.0
50.0 1584 1.8 80 1584 5.8 80 1584 1.5 74 1584 2.4 74 1584 1.2 70 1584 2.0 70 1584 1.2 66 1584 1.8 66 50.0
55.0 1584 1.9 77 1584 4.4 77 1584 1.6 72 1584 2.6 72 1584 1.3 68 1584 2.1 68 1584 1.3 64 1584 2.0 64 55.0
60.0 1584 1.9 74 1584 3.2 74 1584 1.6 70 1584 2.5 70 1584 1.5 67 1584 2.3 67 1584 1.4 62 1584 2.0 62 60.0
67.5 1584 2.1 72 1584 3.4 72 1584 1.8 68 1584 2.7 68 1584 1.8 64 1584 2.5 64 1584 1.6 60 1584 2.1 60 67.5
75.0 1584 2.2 69 1584 3.2 69 1584 2.1 66 1584 3.0 66 1584 2.0 62 1584 2.7 62 1584 1.8 58 1584 2.3 58 75.0
87.5 1584 2.7 66 1584 3.9 66 1584 2.6 63 1584 3.5 63 1584 2.3 59 1584 3.0 59 1584 1.8 50 1584 2.2 50 87.5
100.0 1584 3.3 64 1584 4.6 64 1584 3.1 60 1584 4.1 60 1584 2.6 55 1584 3.4 55 1660 1.2 64 1660 1.9 64 100.0
112.5 1584 3.8 61 1660 3.3 74 1584 3.4 57 1584 4.7 57 1660 1.5 66 1660 2.3 66 1660 1.4 62 1660 2.1 62 112.5
125.0 1660 2.0 71 1660 3.1 71 1584 3.5 52 1584 4.8 52 1660 1.8 64 1660 2.5 64 1660 1.6 60 1660 2.1 60 125.0
137.5 1660 2.2 69 1660 3.1 69 1660 2.1 66 1660 3.0 66 1660 2.0 63 1660 2.8 63 1660 1.8 58 1660 2.3 58 137.5
150.0 1660 2.5 68 1660 3.7 68 1660 2.4 64 1660 3.2 64 1660 2.2 61 1660 2.9 61 1660 1.9 55 1660 2.4 55 150.0
175.0 1660 3.1 65 1660 4.2 65 1660 2.9 61 1660 3.8 61 1660 2.6 57 1660 3.3 57 1760 1.1 67 1760 1.7 67 175.0
200.0 1660 3.6 62 1660 5.3 62 1660 3.2 58 1660 4.5 58 1660 2.7 51 1660 3.4 51 1760 1.2 65 1760 2.0 65 200.0
225.0 1760 2.0 74 1760 3.3 74 1660 3.6 54 1660 4.9 54 1760 1.5 67 1760 2.3 67 1760 1.4 62 1760 2.0 62 225.0
250.0 1760 2.1 72 1760 3.3 72 1760 1.8 68 1760 2.7 68 1760 1.8 65 1760 2.6 65 1760 1.6 60 1760 2.1 60 250.0
275.0 1760 2.2 70 1760 3.1 70 1760 2.1 66 1760 2.9 66 1760 2.0 63 1760 2.7 63 1760 1.7 58 1760 2.2 58 275.0
300.0 1760 2.4 68 1760 3.6 68 1760 2.3 64 1760 3.2 64 1760 2.2 61 1760 2.8 61 1760 1.8 55 1760 2.3 55 300.0
325.0 1760 2.7 66 1760 3.8 66 1760 2.6 63 1760 3.4 63 1760 2.3 59 1760 3.0 59 1760 1.8 51 1760 2.2 51 325.0
350.0 1760 3.0 65 1760 4.1 65 1760 2.8 61 1760 3.7 61 1760 2.6 58 1760 3.3 58 2870 3.4 69 2870 2.5 60 350.0
375.0 1760 3.3 64 1760 4.6 64 1760 3.1 60 1760 4.1 60 1760 2.6 55 1760 3.4 55 2870 3.3 65 2870 2.5 57 375.0
400.0 1760 3.5 62 1760 5.1 62 1760 3.2 58 1760 4.4 58 1760 2.7 52 1760 3.4 52 2870 3.2 63 2870 2.5 55 400.0
425.0 1760 3.9 61 2870 3.6 68 1760 3.5 57 1760 4.8 57 2870 3.9 69 2870 2.9 60 2870 3.0 59 2870 2.5 52 425.0
450.0 1760 4.1 60 2870 3.7 67 1760 3.5 54 1760 4.7 54 2870 3.7 66 2870 2.9 58 2870 2.0 56 2870 2.6 51 450.0
475.0 2870 4.1 69 2870 3.7 66 1760 3.6 51 2870 3.4 62 2870 3.7 65 2870 2.9 56 2870 2.4 54 2870 2.8 48 475.0
500.0 2870 4.1 67 2870 3.7 64 2870 3.9 65 2870 3.4 61 2870 3.8 64 2870 2.9 54 2870 2.7 53 2870 3.0 46 500.0
550.0 2870 4.2 65 2870 3.8 62 2870 4.0 63 2870 3.2 55 2870 3.0 56 2870 3.1 50 2870 3.3 49 2870 3.2 45 550.0
600.0 2870 4.1 61 2870 3.8 59 2870 3.9 60 2870 3.3 53 2870 3.5 54 2870 3.4 47 2870 3.7 45 2870 3.5 41 600.0
650.0 2870 4.1 58 2870 3.8 57 2870 4.0 57 2870 3.6 50 2870 3.9 51 2870 4.5 45 650.0
700.0 . . . 2870 4.3 54 2870 3.8 47 2870 4.2 47 2870 3.9 44 700.0
750.0 . . . . . . . . . . . . 750.0
800.0 . . . . . . . . . 800.0
900.0 . . . 900.0
1000.0 1000.0
1125.0 1125.0
1250.0 1250.0


Start Factor for General Duty (Other than Belt Conveyors) is the nominal torque applied at the inception of acceleration, expressed as a percent of running load torque.
.
Sizes 185/235/270/320/2870 are HFN. Sizes 370/1420/1480 are HFN or HFR depending on mounting arrangement. Sizes 1584/1660/1760/2760 are HFR.

.
Refer to Falk.

F AL K

HFN20 Gear Coupling Mount (Non Delay Fill)
Flex half of Type G gear coupling at input & output, with gap discs, for horizontal mounting. Type G gear coupling hubs furnished interference fit, no setscrew, unless specified otherwise. The fluid coupling drops in or out when gear coupling sleeves are unbolted and retracted.
Availability by Coupling Size & Type
Type Description 185 235 270 320 370 1420 1480
HFN20 Non Delay Fill X X X X X X X

DRIVING END

FILLER/FUSIBLE PLUG 392°F (200°C)

DRIVEN END
FLEX HUB
ELASTOMER GAP DISC .
LUBRICATE THRU SLEEVE
CPLG Cplg Weight lb No Bore & W/O Fluid Allow Dimensions – Inches Maximum Bore † Lube Wt Per Gear WR2 (lb-in2)
• CPLG SIZE *
SIZE * HFN20 Speed rpm A C D F H J M AA BE Shaft Coupling Type G20 Cplg Half-lb Input Output Fluid @ Max Fill
Size Square Key Rect
• Key
185HF 31 1800 4.56 1.69 2.70 3.30 .55 1.53 2.90 8.86 6.10 1010• 1.875 2.125 .05 85 20 13.7 185HF
235HF 62 1800 6.00 1.94 3.40 4.14 .75 1.88 3.20 10.83 7.61 1015 2.375 2.750 .08 232 64 34.2 235HF
270HF 77 1800 6.00 1.94 3.40 4.14 .75 1.88 3.20 12.40 8.43 1015 2.375 2.750 .08 490 106 103 270HF
320HF 97 1800 6.00 1.94 3.40 4.14 .75 1.88 3.20 14.37 8.80 1015 2.375 2.750 .08 907 181 191 320HF
370HF 185 1800 8.38 3.03 5.14 6.10 .86 2.82 4.30 16.73 9.94 1025 3.625 4.000 .25 1,930 445 393 370HF
1420HF 235 1800 8.38 3.03 5.14 6.10 .86 2.82 4.30 18.70 11.14 1025 3.625 4.000 .25 3,200 721 820 1420HF
1480HF 300 1800 9.44 3.59 6.00 7.10 .86 3.30 4.30 21.65 12.68 1030 4.125 4.750 .40 5,630 1,504 1,505 1480HF

* Fluid couplings are offered for horizontal mounting as shown. Consult Falk for other mounting arrangements. Dimensions are for reference only and subject to change
without notice unless certified. †
Type G couplings are furnished with and average INTERFERENCE FIT of .0005” per inch of shaft diameter, without setscrew, unless otherwise specified. Maximum bore
capacity is REDUCED when INTERFERENCE FIT with a setscrew OVER the keyway is specified. Refer to Falk publication 427-105 for allowable bores.
• Replace square shaft key with standard rectangular key for use with these bores. CHECK KEY STRESSES.
• Equivalent mass moment values shown apply only to the fluid coupling with adapters (gear coupling halves not included). Refer to Page 31 for fluid WR2 multipliers for other than maximum fill.

+ For Size 185HFN, the 1010G flex half at the driving end mounts directly to the fluid coupling. The input adapter, and driving and driven end gap discs, are not required.
22 (521-110) © The Falk Corporation, 1982, 2004.
HF20 Gear Coupling Mount (with Delay Fill Chamber)
Flex half of Type G20 (exposed bolt) gear coupling at input & output, with gap discs, for horizontal mounting. Type G gear coupling hubs furnished interference fit, no setscrew, unless specified otherwise. The fluid coupling drops in or out when gear coupling sleeves are unbolted and retracted.
Availability By Coupling Size & Type
Type Description 370 1420 1480 1584 1660
HFD20 Delay Fill X X X X X
HFDD20 Extended Delay Fill X X X X
HFR20 Inactive Delay Fill X X

DRIVING END

METERING ORIFICE,
(3) EQUALLY SPACED
SEE PAGE 11 FOR DETAILS

DRIVEN END
FLEX HUB
ELASTOMER GAP DISC
LUBRICATE THRU SLEEVE
CPLG SIZE * Cplg Weight lb No Bore & W/O Fluid Allow speed rpm Dimensions – Inches Maximum Bore † Lube Wt Per Gear Cplg WR2 (lb-in2)
• CPLG SIZE *
HFD BE Shaft Coupling Type G20 Input Fluid @ Max Fill
HFR HFDD A C D F H J M AA HFD HFR HFDD Size Square Key Rect
• Key Half-lb HFD HFR HFDD Output HFD HFR HFDD
370HF 156 N/A 1800 7.00 2.44 4.14 4.98 0.75 2.34 4.30 16.73 12.69 N/A 1020 2.875 3.250 0.13 1,910 N/A 358 478 N/A N/A 370HF
1420HF 237 246 1800 8.38 3.03 5.14 6.10 0.86 2.82 4.30 18.70 14.38 17.49 1025 3.625 4.000 0.25 3,080 3,240 740 990 N/A 925 1420HF
1480HF 340 353 1800 9.44 3.59 6.00 7.10 0.86 3.30 4.30 21.65 16.16 19.58 1030 4.125 4.750 0.40 5,700 6,030 1,550 1,980 N/A 1,950 1480HF
1584HF 570 592 1500 11.00 4.19 7.00 8.32 1.12 3.84 5.10 26.38 18.00 21.82 1035 4.875 5.750 0.60 12,150 13,000 3,570 4,955 3,844 5,125 1584HF
1660HF 815 844 1200 12.50 4.75 8.25 9.66 1.12 4.38 5.70 29.92 20.64 24.97 1040 5.750 6.500 1.00 22,900 24,400 6,210 9,225 8,167 9,570 1660HF

* Fluid couplings are offered for horizontal mounting as shown. Consult Falk for other mounting arrangements. Dimensions are for reference only, and are subject to change without notice unless certified.
† Type G couplings are furnished with an average INTERFERENCE FIT of .0005” per inch of shaft diameter, without setscrew, unless otherwise specified. Maximum bore capacity is REDUCED when INTERFERENCE FIT with a setscrew OVER the keyway is specified. Refer to Falk publication 427-105 for allowable bores

• Equivalent mass moment values shown apply only to the fluid coupling with adapters (gear coupling halves not included). Refer to Page 31 for fluid WR2 multipliers for other than maximum fill.
+ To use these maximum bores, a customer furnished rectangular key must replace the standard square key that was supplied with the shaft. CHECK KEY STRESSES.
F AL K

HF31, 31-1 Steelflex/Hollow Shaft Mount
Steelflex Type T10 coupling input, hollow shaft output, for horizontal mounting. Hollow shaft is bored to the order, modified clearance fit, with (2) setscrews, one over keyway, one at 90 degrees to keyway. Types HF31, 31-1 diminish the gap required between connected shafts. Type HF31-1 has greater max bore in the hollow shaft, but requires more shaft gap than HF31.
Type Description Availability By Co upling Size & Type
320 370 1420 1480
HFN31 HFD31, 31-1 HFR31, 31-1 Non Delay Fill Delay Fill Inactive Delay Fill X X X X X X X

TYPE 31 TYPE 31-1

Notice HF31, 31-1: Allow clearance for setscrew wrench.
MAXIMUM SHAFT ENGAGEMENT
MIN SHAFT SE ENGAGEMENT

DRIVING END DRIVEN END
DRAIN/FUSIBLE PLUG

SIZES 1420 & LARGER
(FILL PLUG SIZE 320)

TYPES HFD & HFDD 284°F (140°C)

Dimensions Continue on Page 25
METERING ORIFICE,
(3) EQUALLY SPACED SEE PAGE 11 FOR DETAILS

Cplg Weight
lb No Bore & Dimensions – Inches
CPLG W/O Fluid Allow CPLG SIZE .
SIZE . Speed rpm BA IA QA SA † SE (Min) YA
HFN HFD HFR A C D J S AA HFN HFD HFR CA DA EA Fastener Size Types 32 & 32-1 NA Type 31-1 Type 32-1
320HF 89 N/A 1800 5.94 2.50 3.00 3.62 2.06 14.37 13.60 N/A 6.06 3.13 0.88 5/8-11 UNC 2.75 N/A 5.00 0.45 3.20 0.75 320HF
370HF N/A 151 1800 7.62 3.50 4.12 4.56 2.54 16.73 N/A 18.64 7.65 3.52 0.98 3/4-10 UNC 3.83 5.26 5.26 0.45 3.80 0.75 370HF
1420HF N/A 216 1800 8.38 3.88 4.88 4.81 2.82 18.70 N/A 20.76 8.16 4.12 0.98 7/8-9 UNC 4.21 5.50 5.50 0.45 4.40 1.00 1420HF
1480HF N/A 320 1800 9.88 4.75 5.59 6.12 N/A 21.65 N/A 24.65 9.01 4.71 1.09 7/8-9 UNC 5.16 6.50 6.50 0.50 5.00 1.12 1480HF
1584HF N/A 502 1800 10.62 5.00 6.31 6.36 N/A 26.38 N/A 26.74 10.73 5.49 1.00 1 -8 UNC 5.49 N/A 7.50 N/A 5.80 1.12 1584HF
1660HF N/A 727 1800 12.12 5.88 7.06 7.54 N/A 29.92 N/A 31.04 12.75 6.28 1.29 1 1/4-7 UNC 6.33 N/A 9.00 N/A 6.50 1.12 1660HF
1760HF N/A 1176 1500 15.12 7.25 10.00 7.92 N/A 34.25 N/A 36.03 15.00 6.68 1.41 1 1/4-7 UNC 7.69 N/A 10.50 N/A 7.20 1.25 1760HF
2760HF N/A 1176 1800‡ 15.12 7.25 10.00 7.92 N/A 34.25 N/A 36.03 15.00 6.68 1.41 1 1/4-7 UNC 7.69 N/A 10.50 N/A 7.20 1.25 2760HF

. Fluid couplings are offered for horizontal mounting as shown. Refer to Falk for other mounting arrangements. Dimensions are for reference only and are subject to change
without notice unless certified. †
Setscrew sizes: Sizes 320HF thru 1420HF are .375-16X.250. Size 1480HF is .500-13X.250. ‡
Special aluminum components.
24 (521-110) © The Falk Corporation, 1982, 2004.

HF32, 32-1 Steelflex/Hollow Shaft Mount
Steelflex Type T10 coupling input, hollow shaft output, for horizontal mounting. Hollow shaft secured to driven shaft by axial retention fastener, hollow shaft is bored to the order and includes modified transitional fit, no setscrew. Driven shaft end must be drilled & tapped for retention fastener, and fluid coupling includes Falk furnished spacer (spacer machined to length by Falk based on actual shaft engagement dimension provided by customer. Types HF32, 32-1 diminish the gap required between connected shafts. Type HF32-1 has greater max bore in the hollow shaft, but requires more shaft gap than HF32.
Type Description Availabil ity By Coupling Siz e & Type
320 370 1420 1480 1584 1660 1760 2760
HFN32, 32-1 Non Delay Fill X
HFD32, 32-1 Delay Fill X X X X X X
HFR32, 32-1 Inactive Delay Fill X X X X X X

CPLG Stub Shaft Ma Boreximum WR2 (lb -in2)
• CPLG SIZE .
Shaft Coupling † Hollow Shaft
• Input Output Fluid @ Max Fill HFN HFR HFD
SIZE . T Key Type T10 Type 31• Type 31-1
• Type 32
• Type 32-1• Gap Size Sq Key Rect Key ‡ Sq Key Rect Key ‡ Sq Key Rect Key ‡ Sq Key Rect Key ‡ Sq Key Rect Key ‡
320HF 370HF 1420HF 1480HF 1584HF 1660HF 1760HF 2760HF 1.875 2.500 3.000 3.500 4.000 4.500 4.750 4.750 1/2 x 1/2 x 2 1/4 5/8 x 5/8 x 2 3/4 3/4 x 3/4 x 3 7/8 x 7/8 x 3 3/4 1x1x4 1x1x41/2 1 1/4 x 1 1/4 x 5 1/2 1 1/4 x 1 1/4 x 5 1/2 0.125 0.125 0.125 0.188 0.188 0.250 0.250 0.250 1060 2.125 2.375 1080 3.000 3.375 1090 3.500 3.875 1100 4.000 4.500 1110 4.500 5.000 1120 5.000 5.750 1140 7.000 7.250 1140 7.000 7.250 2.250 2.500 2.250 2.500 2.500 2.875 3.000 3.375 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 2.500 2.875 3.000 3.375 3.375 3.750 N/A N/A N/A N/A N/A N/A N/A N/A 2.250 2.500 2.250 2.500 2.500 2.875 3.000 3.375 3.500 3.875 4.000 4.500 4.750 5.500 4.750 5.500 N/A 2.500 2.500 2.875 3.000 3.375 3.375 3.750 4.000 4.500 4.500 5.000 N/A 5.500 N/A 5.500 947 1,910 3,050 5,620 12,100 22,830 38,750 38,750 143 283 570 1,260 2,900 5,080 9,360 9,360 191.0 N/A 393.0 478 820.0 990 1,504 1,980 3,844 4,955 8,167 9,225 14,660 16,230 14,660 16,230 320HF 370HF 1420HF 1480HF 1584HF 1660HF 1760HF 2760HF

. Fluid couplings are offered for horizontal mounting as shown. Refer to Falk for other mounting arrangements. Dimensions are for reference only and are subject to change
without notice unless certified. †
Unless otherwise specified, Sizes 1060T10 thru 1090T10 will be furnished for CLEARANCE FIT with a setscrew OVER the keyway, and Sizes 1100T10 and larger will be furnished for INTERFERENCE FIT without setscrew. Maximum bore capacities of Type T10 coupling hubs are REDUCED when INTERFERENCE FIT with a setscrew OVER the keyway is specified. Refer to Falk publication 427-105 for allowable bores.

To utilize these maximum bores, a customer furnished rectangular key must replace the standard square key that was supplied with the shaft. CHECK KEY STRESSES.
. Types 31 & 31-1 hollow shafts are furnished for a modified CLEARANCE FIT with one setscrew over the keyway and one setscrew at 90° to the keyway. Types 32 & 32-1 hollow shafts are furnished with modified TRANSITIONAL FIT, no setscrew.

• Equivalent mass moment values shown apply only to the fluid coupling (without bore), with stub shaft (flexible coupling not included). Refer to Page 31 for fluid WR2 multipliers for other than maximum fill.

MAXIMUM SHAFT ENGAGEMENT
MIN SHAFT ENGAGEMENT
HOLLOW
SHAFT
METERING ORIFICE,
(3) EQUALLY SPACED
SEE PAGE 11 FOR DETAILS

MIN SHAFT
SE
ENGAGEMENT
DRIVEN END
F AL K

HF25 Disc Coupling Mount
Type FD disc coupling mount with discpack at input & output, for horizontal mounting. A-Hubs furnished interference fit, no setscrew, unless specified otherwise. The fluid coupling drops in or out, in conjunction with discpack/adapter assemblies.
Type Description Av a pling Size & Type
370 1420 1480 1584 ilability by Cou 1660 1760 2760 2870
HFN25 Non Delay Fill X
HFD25 Delay Fill X X X X X X X
HFDD25 Extended Delay Fill X X X X X X
HFR25 Inactive Delay Fill X X X X X X

FILLER/FUSIBLE PLUG

(3) EQUALLY SPACED
SEE PAGE 11 FOR DETAILS

Cplg Weight lb
No Bore & Dimensions – Inches Maximum Bore † WR2 (lb-in2) ‡
CPLG SIZE . W/O Fluid Allow Speed rpm CPLG SIZE .
HFD BE Shaft Coupling Type FD Input Fluid @ Max Fill
HFR HFDD A C D F H K AA HFD HFR HFDD Size Sq. Key HFD HFR HFDD Output HFD HFR HFDD
370HF 184 N/A 1800 9.50 2.92 5.30 6.60 7.75 10.04 16.73 15.60 N/A 190FD06A 3.750 1,870 N/A 650 478 393 N/A 370HF
1420HF 230 239 1800 9.50 2.92 5.30 6.60 7.75 11.50 18.70 17.12 20.23 190FD06A 3.750 2,850 3,010 827 990 820 925 1420HF
1480HF 337 350 1800 11.25 3.43 6.30 7.75 9.50 13.28 21.65 19.50 22.92 340FD06A 4.375 5,214 5,545 1,864 1,980 1,504 1,950 1480HF
1584HF 546 568 1800 12.00 3.82 7.10 8.60 10.25 15.24 26.38 22.18 26.00 625FD06A 5.000 11,200 12,050 3,620 4,955 3,844 5,125 1584HF
1660HF 816 845 1800 15.00 4.60 8.34 10.40 12.50 17.80 29.92 25.25 29.58 1080FD06A 5.750 20,815 22,315 7,290 9,225 8,167 9,570 1660HF
1760HF 1177 1219 1500 16.50 5.30 9.60 11.70 13.75 20.34 34.25 28.88 33.72 1700FD06A 7.000
• 38,520 41,321 14,275 16,230 14,660 15,240 1760HF
2760HF 1177 1219 1800• 16.50 5.30 9.60 11.70 13.75 20.34 34.25 28.88 33.72 1700FD06A 7.000
• 38,520 41,321 14,275 16,230 14,660 15,240 2760HF
2870HF 1685 1758 1500 17.00 5.08 8.38 10.85 13.50 23.60 38.98 31.50 37.09 2500FD08A 5.875 Refer to Falk 2870HF

. Fluid couplings are offered for horizontal mounting as shown. Refer to Falk for other mounting arrangements. Dimensions are for reference only and are subject to change
without notice unless certified. †
Type FD Disc Couplings are furnished with an average INTERFERENCE FIT of .0005” per inch of shaft diameter, without setscrew, unless otherwise specified. Maximum bore
capacity is REDUCED when INTERFERENCE FIT with a setscrew OVER the keyway is specified. Refer to Falk publication 427-105 for allowable bores.
‡ Equivalent mass moment values shown apply only to fluid coupling (without bore). Refer to Page 31 for fluid WR2 multipliers for other than maximum fill.
. Maximum bore is for hub with keyway for rectangular key.

• Special aluminum components.
26 (521-110) © The Falk Corporation, 1982, 2004.

HF132 & 132-1 Tschan/Hollow Shaft Mount
Tschan coupling input, hollow shaft output, for horizontal mounting. Hollow shaft secured to driven shaft by axial retention fastener, hollow shaft is bored to the order and includes modified transitional fit, no setscrew. Driven shaft end must be drilled & tapped for retention fastener, and fluid coupling includes Falk furnished spacer (spacer machined to length by Falk based on actual shaft engagement dimension provided by customer). Types HF132, 132-1 permit smallest possible gap between connected shafts. Type HF132-1 has greater max bore in the hollow shaft, but requires more shaft gap than HF132.
Type Description Availability by Co upling Size & Type
370 1420 1480 1584 1660 1760 2760
HFD132, 132-1 Delay Fill X X X X X X
HFDD132, 132-1 Extended Delay Fill X X X X X
HFR132, 132-1 Inactive Delay Fill X X X X X X

TYPE HF132-1
TYPE HF132
SIZES 1420 & LARGER
TYPES HFD & HFDD

METERING ORIFICE,
(3) EQUALLY SPACED
SEE PAGE 11 FOR DETAILS

MAXIMUM
SHAFT
ENGAGE­MENT

MIN SHAFT
ENGAGE­MENT

HOLLOW
SHAFT

DRAIN/FUSIBLE PLUG 284°F (140°C)
DRIVING END

CPLG SIZE Cplg Only, Weight lb No Bore & W/O Fluid Allow Speed Dimensions – Inches CPLG SIZE .
. rpm BA IA EX SE (Min) YA QA
HFD & HFR HFDD A B C D AA HFD & HFR HFDD CA DA Fastener Size HFD & HFR HFDD
370HF 112 N/A 1800 9.92 2.56 3.11† 7.87 16.73 11.41 N/A 6.74 3.52 3/4 -10 UNC 0.13 N/A 3.80 0.75 4.35 370HF
1420HF 158 167 1800 11.42 2.76 3.54 9.06 18.70 12.88 15.99 7.26 4.12 7/8 -9 UNC 0.28 3.39 4.40 1.00 4.60 1420HF
1480HF 230 243 1800 13.19 3.35 4.33 10.24 21.65 15.06 18.48 8.00 4.71 7/8 -9 UNC 0.80 4.22 5.00 1.12 5.50 1480HF
1584HF 392 414 1800 15.16 3.94 5.12 11.81 26.38 17.05 20.87 9.73 5.49 1 -8 UNC 0.18 4.00 5.80 1.12 6.50 1584HF
1660HF 613 642 1800 17.91 4.84 5.00† 14.17 29.92 20.00 24.33 11.54 6.28 1 1/4 -7 UNC 1.19 5.52 6.50 1.12 7.79 1660HF
1760HF 829 871 1500 20.24 4.92 5.00† 14.17 34.25 22.45 27.29 13.64 6.68 1 1/4 -7 UNC 1.41 6.25 7.20 1.25 9.14 1760HF
2760HF 829 871 1800 . 20.24 4.92 5.00† 14.17 34.25 22.45 27.29 13.64 6.68 1 1/4 -7 UNC 1.41 6.25 7.20 1.25 9.14 2760HF

CPLG SIZE . Maximum Bore WR2 (l b-in2)
• CPLG SIZE .
Tschan Coupling ‡ Hollow Shaft (transitional fit, no ss) Input Output HFR Fluid @ Max Fill HFD HFDD
Type 132 Type 132-1 HFD & HFR HFDD
Size Square Key Square Key Square Key Rectangular Key
• 370HF 1420HF 1480HF 1584HF 1660HF 1760HF 2760HF 200 2.38 230 2.50
• 260 3.38 300 3.75 360 5.12 360 5.12 360 5.12 2.250 2.500 3.000 3.500 4.000 4.750 4.750 2.500 2.875 3.000 3.375 3.375 3.750 4.000 4.500 4.500 5.000 N/A 5.500 N/A 5.500 1,811 N/A 2,802 3,022 5,228 5,608 11,448 12,293 21,186 23,990 38,614 39,938 38.614 39.938 283 570 1,260 2,903 5,076 9,252 9.252 393 820 1,504 3,844 8,167 14,660 14.660 478 990 1,980 4,955 9,225 16,230 16.230 N/A 925 1,950 5,125 9,570 15,240 15.240 370HF 1420HF 1480HF 1584HF 1660HF 1760HF 2760HF

. Fluid couplings are offered for horizontal mounting as show. Refer to Falk for other mounting arrangements. Dimensions are for reference only and subject to change
without notice unless certified. †

Non-standard shortened Tschan hub length. ‡
Tschan coupling hubs are furnished with an average INTERFERENCE FIT of .0005’ per inch of shaft diameter, unless specified otherwise.
. Size 1420HF is available with a 2.88" bore and a .750" x .125" keyway. Falk will furnish a flat key .750" x .500" x 3.5".

• To use these maximum bores, a customer furnished rectangular key must replace the standard square key that was supplied with the shaft. CHECK KEY STRESSES.
.
Equivalent mass moment values shown apply only to the fluid coupling (without bore). Refer to Page 31 for fluid WR2 multipliers for other than maximum fill.

.
Special aluminum components.

© The Falk Corporation, 1982, 2004. (521-110) 27
F AL K

HF41 Sheave/Hollow Shaft Mount
Hollow shaft input, QD sheave output, for horizontal mounting. For all sizes below, Falk furnishes specially manufactured QD Adapter (in lieu of QD bushing) to accommodate QD sheave supplied by purchaser. All sizes below are secured to the motor shaft by a collet/collet draw bolt.
Type Description Availability By coupling Size & Type
185 235 270 320 370
HFN41 HFD41 Non Delay Fill Delay Fill X X X X X X

SHEAVE
(BY PURCHASER)

SHAFT
SE ENGAGEMENT
COLLET
(See Page 29 for Standard Collets)
CPLG SIZE Cplg Weight lb No Bore & W/O Sheave, Fluid Allowable Speed Sheave Adapter Dimensions – Inches CPLG SIZE *
* HFN HFD rpm QD * D E † G N AA BA SE (Min) SE (Max)
185HF 22 N/A 1800 SDS N/A .26 2.29 .99 8.86 7.69 2.00 185HF
235HF 38 N/A 1800 SK N/A .36 2.95 1.31 10.83 9.65 2.50 See 235HF
270HF 50 N/A 1800 SF N/A .42 3.19 1.36 12.40 10.02 2.50 Page 270HF
320HF 81 N/A 1800 E N/A .53 4.21 1.93 14.37 12.48 3.12 29 320HF
370HF 107 114 1800 E 1.45 .53 4.11 3.34 16.73 14.46 3.75 370HF

*
Fluid couplings are offered for horizontal mounting as shown. Refer to Falk for other mounting arrangements. Dimensions are for reference only and are subject to change without notice unless certified.

*
Falk furnishes specially manufactured QD Adapter (in lieu of QD bushing) to accommodate QD sheave supplied by purchaser. †

For Dimensions K and L, refer to sheave tables on Page 29. Dimensions E and L for Sizes 185 thru 370 may vary up to ± .12 inches. For Dimension L, negative value represents dimension to the left of collet face.
FLUID CPLG Collet Min Bore ‡ Coll et Max Bore Inches ‡ WR2 (lb-in2)• FLUID CPLG SIZE
Type HFN Type HFD
SIZE Inches Square Key Rectangular
• Key Input Output Fluid @ Max Fill Input Output Fluid @ Max Fill
185HF .875 1.000 1.125 12 91 13.7 N/A N/A N/A 185HF
235HF 1.125 1.250 1.375 34 217 34.2 N/A N/A N/A 235HF
270HF 1.125 1.750 1.875 77 436 103 N/A N/A N/A 270HF
320HF 1.375 1.875 2.125 154 873 191 N/A N/A N/A 320HF
370HF 1.625 2.125 2.375 299 1,684 393 299 1,718 478 370HF


Minimum bore is the smallest bore to which the collet will be bored. Standard collets (see Page 29). Refer to Falk for non-standard collets.

• To use these maximum bores, a customer furnished rectangular key must replace the standard square key that was supplied with the shaft. CHECK KEY STRESSES.
+ Equivalent mass moment values shown apply only to the fluid coupling (without bore), adapter and sheave. Refer to Page 31, Engineering Data, for fluid WR2 multipliers for other than maximum fill.
28 (521-110) © The Falk Corporation, 1982, 2004.

Sheave Selection

Classical Sheaves (A, B, C) Narrow Sheaves (3V, 5V)
CPLG SIZE * K L † Pitch Diameter Grooves Classical Sheaves Sheave Adapter (QD) *
1.38 0.16 4.2-9.0 2 A
1.38 0.29 10.6,12.0 2 A
0.88 -0.15 4.2-6.4 1 B ‡
1.00 0.16 6.6-13.2 1 B ‡
185HF 1.75 0.35 4.2-6.4 2 B ‡ SDS
0.88 -0.15 4.6-6.8 1 B
1.00 0.16 7.0-13.6 1 B
1.75 0.35 4.6-6.8 2 B
1.38 -0.06 15.0,18.0 2 A
2.00 0.13 7.0-9.0 3 A
2.00 0.26 10.6-18.0 3 A
1.00 -0.30 15.0-19.6 1 B ‡
1.75 0.13 6.6-18.0 2 B ‡
2.50 0.63 6.6-18.0 3 B ‡
3.25 1.07 6.6-13.2 4 B ‡
235HF 4.00 1.51 6.2, 6.4 5 B ‡ SK
4.75 2.26 6.2, 6.4 6 B ‡
1.00 -0.30 15.4-20.0 1 B
1.75 0.13 7.0-18.4 2 B
2.50 0.63 7.0-18.4 3 B
3.25 1.07 7.0-13.6 4 B
4.00 1.51 6.6, 6.8 5 B
4.75 2.26 6.6, 6.8 6 B
1.75 0.22 19.6-37.6 2 B ‡
2.50 0.72 19.6-29.6 3 B ‡
3.25 1.09 15.0-19.6 4 B ‡
4.00 1.53 7.0-18.0 5 B ‡
4.75 1.90 7.0-18.0 6 B ‡
5.50 2.53 7.0 7 B ‡
6.25 3.28 7.0 8 B ‡
270HF 1.75 2.50 0.22 0.72 20.0-38.0 20.0-30.0 2 3 B B SF
3.25 1.09 15.4-20.0 4 B
4.00 1.53 7.4-18.4 5 B
4.75 1.90 7.4-18.4 6 B
5.50 2.53 7.4 7 B
6.25 3.28 7.4 8 B
1.38 0.09 7.0-24.0 1 C
2.38 0.40 7.0-11.0 2 C
2.50 0.34 37.6 3 B ‡
3.25 0.71 24.6-37.6 4 B ‡
4.00 1.21 19.6-37.6 5 B ‡
4.75 1.84 19.6-37.6 6 B ‡
5.50 1.96 8.2-15.6 7 B ‡
6.25 2.34 8.2-15.6 8 B ‡
2.50 0.34 38.0 3 B
3.25 0.71 25.0-38.0 4 B
320HF 4.00 4.75 1.21 1.84 20.0-38.0 20.0-38.0 5 6 B B E
5.50 1.96 8.6-16.0 7 B
6.25 2.34 8.6-16.0 8 B
3.38 0.08 8.5-18.0 3 C
3.38 0.84 20.0, 24.0 3 C
4.38 0.84 8.5-18.0 4 C
4.38 1.34 20.0 4 C
5.38 1.46 8.5-18.0 5 C
6.38 2.46 8.5 6 C
2.50 0.34 37.6 3 B ‡
3.25 0.71 24.6-37.6 4 B ‡
4.00 1.21 19.6-37.6 5 B ‡
4.75 1.84 19.6-37.6 6 B ‡
5.50 1.96 8.2-15.6 7 B ‡
6.25 2.34 9.0-15.6 8 B ‡
2.50 0.34 38.0 3 B
3.25 0.71 25.0-38.0 4 B
370HF 4.00 1.21 20.0-38.0 5 B E
4.75 1.84 20.0-38.0 6 B
5.50 1.96 8.6-16.0 7 B
6.25 2.34 9.4-16.0 8 B
3.38 0.08 9.0-18.0 3 C
3.38 0.84 20.0, 24.0 3 C
4.38 0.84 9.0-18.0 4 C
4.38 1.34 20.0 4 C
5.38 1.46 9.2-18.0 5 C

CPLG SIZE * K L † Outside Diameter Grooves Narrow Sheaves Sheave Adapter (QD) *
.69 –.02 8.0 1 3V
.75 .04 10.6 1 3V
185HF 1.09 .07 6.5-8.0 2 3V SDS
1.50 .01 4.5-6.9 3 3V
1.91 .38 5.6 4 3V
.81 –.37 14.0, 19.0 1 3V
1.09 –.34 10.6-19.0 2 3V
1.50 .07 8.0-14.0 3 3V
1.91 .01 6.0-14.0 4 3V
235HF 2.31 2.72 .19 .23 5.3-10.6 6.9 5 6 3V 3V SK
2.72 .66 8.0 6 3V
3.53 1.04 6.9 8 3V
4.34 1.73 6.9 10 3V
1.69 .07 7.1-11.8 2 5V
1.09 –.32 25.0 2 3V
1.50 .09 19.0-33.5 3 3V
1.91 .12 19.0, 25.0 4 3V
2.31 .28 14.0,19.0 5 3V
270HF 2.72 .68 10.6,14.0 6 3V SF
3.53 1.25 8.0, 10.6 8 3V
4.34 1.68 8.0 10 3V
1.69 .09 12.5-21.2 2 5V
2.38 .22 7.1-11.8 3 5V
1.91 –.13 33.5 4 3V
2.31 .15 25.0, 33.5 5 3V
2.72 .18 19.0-33.5 6 3V
3.53 .74 14.0-25.0 8 3V
4.34 1.55 10.6-19.0 10 3V
320HF 1.69 2.38 –.06 .08 23.6 12.5-28.0 2 3 5V 5V E
3.06 .08 8.0-16.0 4 5V
3.06 .27 18.7, 21.2 4 5V
3.75 .46 8.5-16.0 5 5V
4.44 .90 8.5-11.8 6 5V
5.81 1.77 9.0 8 5V
1.91 –.13 33.5 4 3V
2.31 .15 25.0, 33.5 5 3V
2.72 .18 19.0-33.5 6 3V
3.53 .74 14.0-25.0 8 3V
4.34 1.55 10.6-19.0 10 3V
370HF 1.69 –.06 23.6 2 5V E
2.38 .08 12.5-28.0 3 5V
3.06 .08 8.0-16.0 4 5V
3.06 .27 18.7, 21.2 4 5V
3.75 .46 9.0-16.0 5 5V
4.44 .90 9.0-11.8 6 5V

* † * See Page 28 for these footnotes.
Standard Collets (Refer to Falk for Special Collets)
COUPLING SIZE Collet Part Number Motor Shaft-in SE (Max)
185HF 346150 346151 0.875 1.125
• 2.12 2.88
235HF 346153 346154 1.125 1.375
• 2.88 3.66
270HF 346155 346156 346157 346158 1.125 1.375 1.625 1.875
• 2.88 3.66 4.88 4.88
320HF 346159 346160 346161 346162 1.375 1.625 1.875 2.125
• 3.66 4.88 4.88 5.64
370HF 346163 346164 346165 346166 1.625 1.875 2.125 2.375
• 4.88 4.88 5.64 6.40

* † * See Page 28 for these footnotes. ‡
Size A belt in Type B sheave.
. Maximum bore collet requires that standard square shaft key be replaced with customer furnished rectangular key. Service Manual 528-410, Table 2, provides rectangular key sizes. CHECK KEY STRESSES.

F AL K

HF41 Sheave/Hollow Shaft Mount
Hollow shaft input, sheave output, for horizontal mounting. For all sizes below, a specially manufactured sheave is supplied by Falk. Size 1420HF is secured to the motor shaft by a collet/collet draw bolt. Sizes 1480HF & 1584HF are secured to motor shaft by an axial retention fastener, the hollow shaft is bored to the order and includes modified transitional fit, no setscrew, motor shaft end must be drilled & tapped for retention fastener, and coupling includes Falk furnished spacer (spacer to length by Falk based on actual shaft engagement dimension provided by customer).
Type Description Availability By Coupling Size & Type
1420 1480 1584
HFN41 Non Delay Fill X X X
HFD41 Delay Fill X X X

FILLER/FUSIBLE PLUG 392°F (200°C)

SHEAVE
(BY FALK)
SHEAVE
(BY FALK)
MAXIMUM SHAFT ENGAGEMENT
MINIMUM SHAFT
COLLET
ENGAGEMENT (PAGE 31)
Sizes 1480 & 1584
Predesigned Sheaves for Size 1420HF41
FILLER/FUSIBLE PLUG 392°F (200°C) IA FASTENER

Part Number
Description
0428352
9.75” OD, 5V-5 groove
0428231
9.75” OD, 5V-8 groove
0428353
11.8” OD, 5V-5 groove
0428162
11.8” OD, 5V-10 groove

CPLG Cplg Weight lb No Bore & W/O Sheave, Fluid Allowable Dimensions – Inches CPLG SIZE *
SIZE * HFN HFD Speed rpm D G N AA BA IA Fastener Size QA (Max Shaft Engagement) SE ‡ (Min)
1420HF 160 168 1800 2.35 6.74 4.71 18.70 19.25 . . . . . . 4.38* 1420HF
1480HF 159 172 1800 . . . 8.07 2.99 21.65 19.80 7/8-9 UNC 8.25 5.62 1480HF
1584HF 276 295 1800 . . . 8.07 2.91 26.38 21.30 1-8 UNC 10.00 6.25 1584HF

*
Fluid couplings are offered for horizontal mounting as shown. Refer to Falk for other mounting arrangements. Dimensions are for reference only, and are subject to change without notice unless certified.

*
Size 1420HF, see Page 31 for dimensions K, L, and SE (Max). ‡

The preferred engagement between the driving shaft and the hollow bore is twice the diameter of the driving shaft.
FLUID CPLG SIZE Min Bore Max Bo re – Inches WR2 (lb -in2)
• FLUID CPLG SIZE
Square Key Rectangular Key
• Type HFN Type HFD
Input Output Fluid @ Max Fill Input Output Fluid @ Max Fill
1420HF 1.875 † 3.000 3.375 663 2,460 820 663 2,529 990 1420HF
1480HF 2.062 3.750 4.125 1,230 4,440 1,504 1,230 4,615 1,980 1480HF
1584HF 2.250 4.000 4.375 2,840 9,910 3,844 2,840 10,080 4,955 1584HF

Minimum bore is the smallest bore to which the collet will be bored. Standard collets (see Page 31). Refer to Falk for non-standard collets.

• To use these maximum bores, a customer furnished rectangular key must replace the standard square key that was supplied with the shaft. CHECK KEY STRESSES.
+ Equivalent mass moment values shown apply only to the fluid coupling (without bore), and sheave. Refer to Page 31, Engineering Data, for fluid WR2 multipliers for other than maximum fill.
30 (521-110) © The Falk Corporation, 1982, 2004.

HF41 Sheave & Collet Data (Sizes 1420 thru 1584HF)

Classical Sheaves (B, C, D) Narrow Sheaves (3V, 5V, 8V)
CPLG SIZE . Pitch Diameter Grooves Classical Sheaves
11.0 -15.4 10 B
1480HF 9.8 -10.2 11.0 -14.0 6 8 C C
12.0 -15.5 5 D
1584HF 11.0 & 12.4 12.4 -16.0 9.8 -13.0 13.0 -16.0 12.0 & 13.0 13.0 -17.0 6 8 4 5 3 4 B B C C D D

.
Dimensions are for reference only, and are subject to change without notice unless certified.

.
Size 1420 Dimension L, negative value represents dimension to the left of collet face.

CPLG SIZE . K L
• Outside Diameter Grooves Narrow Sheaves
1420HF 3.75 5.81 7.19 –2.99 –.93 .45 9.75 & 11.8 9.75 11.8 5 8 10 5V 5V 5V
1480HF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0 & 10.6 10.6 & 14.0 8.0 -10.3 10.9 -16.0 12.5 -16.0 15 19 8 10 6 3V 3V 5V 5V 8V
1584HF . . . . . . . . . . . . . . . . . . . . . . . . 9.75 -14.0 13.2 -16.0 12.5 -14.0 13.2 -18.0 8 10 6 8 5V 5V 8V 8V

Standard Collets † (Refer to Falk for Special Collets)
CPLG SIZE Collet Part Number Motor Shaft-inches SE (Max)
346167 1.875 4.88
1420HF 346168 346169 2.125 2.375 5.64 6.40
346170 2.875 8.00
346329 3.375
• 8.44


Sizes 1480HF & 1584HF do not utilize a collet.
. Maximum bore collet requires that standard square shaft key be replaced with customer furnished rectangular key. Service Manual 528-410, Table 2, provides rectangular key sizes. CHECK KEY STRESSES.

Engineering Data

Shaft Diameters and Ratings for NEMA 60 Hertz Motors
Frame Size T Frames TS Frames
143 145 182 184 213 215 254 256 284 286 324 326 364 365 404 405 444 445 284 286 324 326 364 365 404 405 444 445
Shaft Dia – Inches .875 .875 1.125 1.125 1.375 1.375 1.625 1.625 1.875 1.875 2.125 2.125 2.375 2.375 2.875 2.875 3.375 3.375 1.625 1.625 1.875 1.875 1.875 1.875 2.125 2.125 2.375 2.375
HP @ 1800 RPM Drip Proof 1 1 1/2 -2 3 5 7 1/2 10 15 20 25 30 40 50 60 75 100 125 150 200 25 30 40 50 60 75 100 125 150 200
TEFC 1 1 1/2 -2 3 5 7 1/2 10 15 20 25 30 40 50 60 75 . . . 100 125 150 25 30 40 50 60 75 . . . 100 125 150
HP @ 1200 RPM Drip Proof & TEFC 3/4 1 1 1/2 2 3 5 7 1/2 10 15 20 25 30 40 50 60 75 100 125 15 20 25 30 40 50 60 75 100 125
HP @ 900 RPM Drip Proof & TEFC 1/2 3/4 1 1 1/2 2 3 5 7 1/2 10 15 20 25 30 40 50 60 75 100 10 15 20 25 30 40 50 60 75 100

Fluid WR2 Multiplier For Other Than Recommended Keys for Bores with One Key Maximum Fill
Fill Angle° 55 60 65 70 75 80 85 90 95 100
HFN .98 .94 .90 .86 .81 .78 .74 .69 .63 .59
HFD .98 .94 .93 .88 .84 .80 .77 .71 .66 .62
HFDD † . . . . . . .98 .95 .94 .90 .86 .82 .79 .74

Shaft Diameters Shaft Diameters Key
Over Thru Key Over Thru
.437 .562 .875 1.250 1.375 1.750 2.250 .562 .875 1.250 1.375 1.750 2.250 2.750 .125 x .125 .187 x .187 .250 x .250 .312 x .312 .375 x .375 .500 x .500 .625 x .625 2.750 3.250 3.750 4.500 5.500 6.500 7.500 3.250 3.750 4.500 5.500 6.500 7.500 9.000 .750 x .750 .875 x .875 1.000 x 1.000 1.250 x 1.250 1.500 x 1.500 1.750 x 1.500 2.000 x 1.500


Maximum fluid fill for Type HFDD is 60°.

F AL K

Fluid Fill Angle

Fluid couplings are shipped without fluid. Fluid is added during installation. The installer adds fluid, obtained locally, and that meets “Recommended Fluids” specifications listed on this page.
When application data (horsepower, rpm, start factor) is provided, the fluid coupling will include an orange sticker with fill angle (degrees), and approximate fill quantity (fluid ounces). If no orange sticker is present, a fill angle may be obtained from the Quick Selection Tables herein (Pages 16-21). Using fill angle as a starting point, approximate fill quantity (fluid ounces) may be obtained from the table below.
Fluid couplings include an angle finder (P/N 1224653) and installation instructions. Remove fill plug, place angle finder on the flat boss at the fill plug location, and rotate coupling to the specified fill angle (degrees from vertical) With the coupling in this position, add fluid until it reaches the lip of the fill hole.
As shown above, a low fill angle (example is 50°) corresponds to a high level of fill. A high fill angle (example is 100°) corresponds to a low level of fill. The level of fill in the coupling determines the start factor, percent slip, starting torque, stall torque,... essentially all performance characteristics of the coupling.
After installation and operation, fine-tuning of the fill level may be necessary, based on load readings or other site variables. In general, increasing the fill level (decreasing the fill angle) increases start factor/start torque/stall torque, shortens time required to accelerate the load to operating speed, and reduces percent slip. Reducing the fill level (increasing the fill angle) decreases start factor/start torque/stall torque, increases time required to accelerate the load to operating speed, and increases percent slip.
Convert Fluid Ounces to Weight (lb)
There are 128 Fluid Ounces per Gallon Weight (lb) = Fluid oz x 0.0648 x specific gravity of the fluid
Example:
Size 1480HFN @ 70 degree fill angle (See table below) Weight = 413 fluid oz x 0.0648 x 0.87 = 23.3 lb of fluid

Recommended Fluids †
ISOViscosityGrade,PetroleumOils(R&O) ···········46 ISOViscosityGrade,SyntheticOils ··················32
Viscosity at 104°F(40°C) — 46 cSt (215 SSU)
Viscosity Index — Equal to or greater than 95.
Pour Point — Must be 5°F(3°C) lower than minimum

starting temperature. Flash Point — 400°F(204°C) when using 140°C and/or 180°C fusible plugs. Flash Point — 425°F (218°C) when using 200°C fusible plugs at both fill and drain holes. Specific Gravity — 0.87 Antioxidant and Anti-foaming Additives
Petroleum Oils (R & O)
For Ambient Temperatures 20°F to 125°F (-6°C to 52°C)

Manufacturer
Fluid

Amoco Oil Company
American Industrial Oil 46

BP Oil Company
HL-C46

Chevron Products Company
Hydraulic Oil AW 46

Exxon Company, USA
Teresstic 46

Mobil Oil Corporation
Mobil Fluid 424

Petro-Canada Products
Harmony 46

Shell Oil Company
Turbo T 46

Texaco Lubricants Company
Rando Oil HD 46

76 Lubricants Company
76 Unax AW 46
Petroleum Oils (R & O)
For Ambient Temperatures -20°F to 125°F (-28°C to 52°C)

Manufacturer
Fluid

Amoco Oil Company
American Industrial Oil 46

Mobil Oil Corporation
Mobilfluid 424
Synthetic Oils and Synthetic Transmission Fluids
For Ambient Temperatures -40°F to 125°F (-40°C to 52°C)

Manufacturer
Fluid

Conoco Incorporated
Syncon R&O 32

Exxon Company, USA
Teresstic SHP 32

Mobil Oil Corporation
SHC 624

Texaco Lubricants Company
Pinnacle 32

Mobil Oil Corp.
Synthetic ATF

Chevron
Synthetic All Weather THF

Citgo
Transgard Fluid 250
Automatic Transmission Fluids (Dexron or Mercon Oils, etc.)
For Ambient Temperatures -40°F to 125°F (-40°C to 52°C)

NOTICE: Automatic Transmission Fluids below can only
be used with two 140°C fusible plugs

Mobil Multi-purpose ATF
Texaco (Havoline) Mercon/Dexron-III or ATF
Citgo Transgard ATF,Type F

ATF Type A and Type Dexron II, llD, llE, lll, Mercon M-891205 and M-921253 †
Refer to Falk for use of fire resistant fluids. Recommended fluids are typical products only, and should not be construed as exclusive recommendations.
Approximate Fill Quantity (Fluid Ounces)

Fill Angle (Degrees) From Vertical Types HFN & HFR Type HFD Type HFDD Fill Angle (Degrees) From Vertical
COUPLING SIZE
185 235 270 320 370 1420 1480 1584 1660 1760 2760 370 1420 1480 1584 1660 1760 2760 1420 1480 1584 1660 1760 2760
50 34 65 88 142 239 352 524 862 1555 2147 303 440 710 1136 1833 2645 N/A N/A N/A N/A N/A 50
55 33 63 83 136 233 331 497 835 1481 2012 292 426 663 1096 1762 2492 N/A N/A N/A N/A N/A 55
60 31 60 78 128 221 311 473 801 1413 1894 276 399 629 1055 1684 2360 524 795 1322 1924 2705 60
65 30 57 73 120 207 291 443 754 1319 1792 257 382 578 977 1569 2164 484 727 1224 1789 2503 65
70 28 53 69 113 192 271 413 700 1234 1640 237 348 531 910 1461 1985 443 663 1130 1650 2300 70
75 26 50 65 105 177 247 385 649 1150 1539 218 328 497 832 1359 1846 406 605 1045 1529 2131 75
80 24 47 61 98 162 230 348 592 1065 1420 200 298 460 751 1248 1701 369 561 964 1403 1961 80
85 22 43 57 90 149 216 321 544 984 1336 185 281 419 693 1150 1600 342 521 896 1295 1809 85
90 20 39 52 82 136 196 294 504 910 1217 172 252 379 639 1048 1454 315 480 822 1184 1657 90
95 18 34 47 75 124 172 267 456 825 1099 159 227 335 585 893 1322 294 443 754 1048 1505 95
100 16 30 44 72 115 156 247 423 754 1015 142 203 291 528 876 1177 271 402 687 947 1353 100
105 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 179 245 485 783 1015 247 365 622 859 1228 105

32 (521-110)

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