Timken Bearing Dimension Catalog

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Catalog 699

BEARING DIMENSION CATALOG
• EXPLANATION OF TIMKEN® BEARING SYMBOLS
• BEARING DIMENSIONS BY PART NUMBER
• BEARING DIMENSIONS BY CORE BORE

PROUDLY MANUFACTURED IN TIMKEN COMPANY PLANTS THROUGHOUT THE WORLD
NOT TO BE USED AS A DESIGN MANUAL

THE TIMKEN COMPANY $25 (U.S. Dollars)

BEARING DIMENSION CATALOG 699

$25 (U.S. Dollars)

www.timken.com
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©1999 The Timken Corporation
WORLDWIDE LEADER IN BEARINGS AND STEEL
Printed in U.S.A. 4-99 Order No. 7011

WORLDWIDE LEADER IN BEARINGS AND STEEL

BEARING

DIMENSION

CATALOG

INCLUDES:
• EXPLANATION OF TIMKEN® BEARING SYMBOLS
• BEARING DIMENSIONS BY PART NUMBER
• BEARING DIMENSIONS BY CORE BORE

BEARING COMPONENTS ARE SHOWN IN BOTH METRIC AND INCH UNITS. For each part number the top line is millimeters, bottom line is inches.
BEARING COMPONENT WEIGHTS ARE SHOWN IN BOTH METRIC AND POUND UNITS. For each part number the top line is kilograms, bottom line is pounds.
NOT TO BE USED AS A DESIGN MANUAL This is not a manual for the selection of bearings for new applications. Whenever it is necessary to select Timken bearings for new applications consult the Bearing Selection Handbook or get in touch with the nearest office of The Timken Company.
Every effort has been made to ensure that the data listed in this catalog is correct.
However, we cannot assume responsibility for possible error.

©COPYRIGHT 1999 BY THE TIMKEN COMPANY

INDEX
EXPLANATION OF TIMKEN BEARING SYMBOLS
1. FITTING PRACTICES

2. 5A THRU 935 SERIES

3. 1100 THRU 9900 SERIES

4. 00000 THRU LM29700 SERIES

5. 29800 THRU 99000 SERIES

6. 100000 THRU HH249900 SERIES

7. 250000 THRU 299000 SERIES

8. LM300800 THRU 690000 SERIES

9. 700000 THRU LL989300 SERIES

10. IsoClass™

11. BEARING TYPES

UNIT-BEARINGTM DUO-FACE® PLUS SEAL STEERING GEAR CROSSED ROLLER THRUST HYDRA-RIBTM UNIPACTM

12. K PARTS

13. NP & XC PARTS

14. AUXILIARY PARTS

15. CONE BORE SECTION

WARNING!

Failure to observe the following warnings could lead to a risk of serious bodily harm:
• Never spin a bearing with compressed air. The rollers may be forcefully expelled.
• If a hammer and bar are used for bearing removal, fragments from the hammer, bar, or the bearing can be released with high velocity. NOTE: A mild steel bar is preferred since it is less susceptible to fragmenting.
• When installing or removing bearings, always wear safety glasses or goggles.

Failure to observe the following instructions can result in equipment failure leading to a risk of serious bodily harm:
• Proper maintenance and handling practices are critical. Follow installation instructions and maintain proper lubrication.
• Do not attempt to disassemble unitized bearings. Components may be damaged.
• Do not use a damaged bearing.
• Do not mix parts of matched assemblies. Bearing damage could result.

Actual bearing performance is affected by many factors beyond the control of The Timken Company. Therefore, the feasibility of all bearing applications should be validated by the customer. The data contained in this guide is intended for reference purposes and will assist you in part number and external bearing dimension identification.
i

Considering the performance demands placed on tapered roller bearings, it’s rather amazing how simple the basic design really is. Timken tapered roller bearings minimize friction because of the interrelationship of the bearing’s four basic parts:
• The inner ring, or cone, is mounted onto the shaft.
• The outer ring, or cup, sits in the housing (hub).
• The tapered rollers, or rolling elements, allow relative motion between the cone and cup thus minimizing fric­tion between the two.
• The cage, or separator, spaces and holds the rolling ele­ments in the proper position.
• The races are the surfaces on the cup and cone where the rolling elements make contact.

The tapered roller bearing’s most important dimensions are:
• The outside diameter of the outer ring, or cup, is known as the O.D. (D). The other basic dimension of this part is the cup width (C). Both are important for fitting the bearing onto the housing.
• The inside diameter of the inner ring, or cone is called the bore (d). This diameter must be correct in order to fit the bearing onto the shaft. The other basic dimension of this part is the cone width (B).
• When cup and cone are mated (including rollers and cage), the overall dimension is called the overall bear­ing width (T).

Bearing components or assemblies must be in alignment. Their fit onto a shaft or within a housing must be square or in alignment by checking:
• The maximum shaft radius (R), which allows the cone backface to make contact with the shoulder of the shaft.
• The maximum housing radius (r), which allows the cup backface to make contact with the shoulder of the housing.

INNER RING
(CONE)
CONE
ASSEMBLY
ROLLING ELEMENTS
(TAPERED ROLLERS)
OUTER RING
(CUP)
CAGE

ii

Spacer Bearing Assemblies
Spacer bearing assemblies speed up bearing installation time because there is no need for bearing adjustment. Spacer bearing assemblies are suitable for use with two-row and four-row Timken® tapered roller bearings to preset the bench lateral (bench end play). Most matched bearing assemblies have serial numbers to ensure correct installation sequence.
Timken spacer bearings are precisely ground to provide the exact bench lateral required for the particular bearing application.
Since each spacer is custom-fitted to a particular set of components, a spacer cannot be used with any other bearing components – even if they carry the same part numbers.
When ordering replacement bearing assemblies, specify:
• cone number
• assembly number.

If you do not have the assembly number, specify the component part numbers including:
• cone number
• cup number
• spacer number
• bench end play, which is etched on the spacer.

If you do not have any part numbers for the spacer assembly, specify:
• Name of equipment
• Model number
• Year
• Application position of the bearing.

WARNING: Always follow manufacturer’s instructions. Failure to follow all instructions and to properly lubricate the bearing can cause equipment failure, creating a risk of serious bodily harm.
Over-filling or under-filling a wheel hub with lubricant may result in premature component failure. Creating a risk of serious bodily harm.
Never spin a bearing with compressed air. The rollers may be forcefully expelled, creating a risk of serious bodily harm.
DO NOT MIX PARTS.

Tapered Double Outer (TDO)
This diagram depicts the way spacers are used between the cone front faces in the TDO bearing. The spacer fits between the two single cones.
CONE ASSEMBLY DOUBLE CUP SPACER CONE ASSEMBLY

Tapered Double Inner (TDI)
Here is an example of how spacers are used between the cup front faces in the type TDI bearing. The spacer fits between the two single cups.
CUP SPACER DOUBLE CONE ASSEMBLY CUP

iii

This guide contains the basic information for most general-use parts in production by The Timken Company. The data contained within this guide is intended for reference purposes and will assist you in part number and external bearing dimension identification.
What you will find
• Cup and cone combinations are grouped by series designation. Dimensional information, inch and metric form, is provided for each cup and cone combination and includes the following:
• Where additional characteristics are important to differentiate between parts, the part number is proceeded by an asterisk (*). These characteristics are available in the remarks column.

NOMENCLATURE DIMENSION SYMBOL
• bore size “d”
• outside diameter (O.D.) “D”
• bearing width “T”
• cone width “B”
• cup width “C”
• shaft and housing max fillet radii “R” for cones – “r” for cups
• bearing weight

How to find part numbers
• If you know the part number, use the index to locate the section where you will find the part. Once in that section, series are arranged in ascending order.
• If you only know the cone bore dimension, use the section titled BEARING DIMENSION BY CONE BORE to find an appropriate series.

iv

PREFIX SUFFIX CONE OR CUP EXPLANATION
A Cone & Cup Standard basic series part number.
A Cone Different bore from basic part number.
A Cone Different complement of rollers.
A Cone Different radius from basic part number.
A Cup Different OD from basic part number.
A Cup Different radius from basic part number.
A Cup Different width from basic part number.
AA Cone & Cup Different bore, OD, width, or radius from basic part number.
AB Cone Different bore, width, or radius from basic part number, assembled
with brass cage.
AB Cup Flanged cup. (Non-interchangeable with basic part number.)
AC Cone Different bore or radius, different internal geometry.
AC Cup Different OD, width, or radius from basic part number.
AD Cup Double cup. (Non-interchangeable with basic part number.)
ADW Cone Double cone. Pilots and slots each end, holes in large rib.
AH Cone Assembled with special cage, rollers, and/or Duo-Face internal geometry.
(Non-interchangeable with basic part number.)
AL Cone Assembled with Duo-Face seal.
ARB Cup Single cup with snap ring groove in OD.
AS Cone & Cup Different bore, OD, width, or radius from basic part number.
ASB Cone Single cone, different bore or width from basic part number, assembled with
brass cage.
AV Cone & Cup Made of special steel.
AW Cone & Cup Keyway or slotted cone or cup.
AX Cone & Cup Different bore, OD, width, or radius from basic part number.
AXB Cone Different bore, width, or radius from basic part number,
assembled with brass cage.
AXD Cup IsoClass cup -double cup without oil holes or groove.
AXV Cone & Cup Different OD, width, or radius from basic part number. Made of special steel.
AXX Cone & Cup Different OD, width, or radius from basic part number. Made of special steel.
B Cup Flanged cup. (Non-interchangeable with basic part number.)
B Cone & Cup IsoClass bearing with same boundary dimensions as basic part number,
but with different internal geometry, steeper included cup angle.
BA Cup Flanged cup. (Non-interchangeable with basic part number.)
BNA Cone IsoClass cone used in assemblies with 2 cones mated with double cup to form
a double row non-adjustable bearing. (Non-interchangeable with other cones
having the same basic part numbers which may vary in bore or width
dimensions.)
BR Cup Single cup with groove in OD for snap ring.
BS Cup Flanged cup. (Non-interchangeable with basic part number).
BW Cup Flanged cup with slot.
(Non-interchangeable with basic part number.)
BXX Cup Flanged single cup. Made of special steel.
C Cone Single cone, envelope dimensions same as basic part number, different
internal geometry.
C Cup Dimensionally different from basic part number. (Non-interchangeable).
CA Cone Single cone, envelope dimensions same as basic part number, different
internal geometry.
CB Cone Single cone, dimensionally different from basic part number.

v

PREFIX SUFFIX CONE OR CUP EXPLANATION
CD Cup Double cup with oil holes and groove. One hole counter-bored for locking pin.
CE Cup Dimensionally different from basic part number.
(Non-interchangeable.)
CN Cup Neoprene cushioned cup.
CP Cone & Cup Flash chrome plated. Otherwise, interchangeable with basic part number.
CP Cone & Cup Envelope dimensions same as basic part number, different internal
geometry, customized for performance.
CR Cone & Cup Ribbed cup bearing series.
CS Cone & Cup Dimensionally different from basic part number.
(Non-interchangeable.)
CX Cone Dimensionally different from basic part number.
(Non-interchangeable.)
D Cone & Cup Double cone or Double cup. (Non-interchangeable with basic part number.)
DA Cone Double cone. (Non-interchangeable with cones having same basic
part number.)
DA Cup Spherical OD double cup. (Non-interchangeable with basic part
number or other double cups having same basic numbers.)
DB Cup Double cup with flange. (Non-interchangeable with basic part
number or double cups having same basic numbers.)
DB Cone Double cone assembled with brass cages.
DC Cup Double cup with hole for locking pin.
DD Cone & Cup Special long double cone or cup. (Non-interchangeable with basic part
number or other double parts having same basic numbers.)
DE Cone & Cup Double cone or double cup having different dimensions or other
characteristics from single and double parts identified with same
basic part number.
DF Cup Double cup with oil holes and groove. Snap ring groove on OD.
DG Cone Double cone with groove in bore.
DGW Cone Double cone with pressure removal groove in bore, and having face slots.
DH Cone Double cone with special cage, rollers, and/or internal geometry.
(Non-interchangeable with basic part number.)
DP Cone Double cone with puller groove.
DR Cup Double cup for ribbed cup series. (Non-interchangeable with single
and double cups identified with same basic part number.)
DRB Cup Double cup with snap ring groove.
DS Cup Crowned OD double cup. (Non-interchangeable with other cups having same
basic part numbers.)
DT Cup Tapered OD double cup. (Non-interchangeable with other cups having same
basic part numbers.)
DV Cone & Cup Double cone or double cup made of special steel.
DVH Cone Double cone, special steel, and/or internal geometry. (Non-interchangeable
with basic part number.)
DW Cone & Cup Double cone or double cup with keyway or slot.
(Non-interchangeable with cones or cups identified with same
basic part numbers.)
DWA Cone Double cone with one end extended and with oil slots in extended end.
DWH Cone Double cone with oil slots, assembled with special cage, rollers, and/or
internal geometry. (Non-interchangeable with basic part number.)
DWV Cone & Cup Double cone or double cup with keyway or slot. (Non-interchangeable with
cones or cups identified with same basic part numbers.) Made of special steel.

vi

PREFIX SUFFIX CONE OR CUP EXPLANATION
DX Cup Adaptor for spherical or straight OD cup.
DXX Cone & Cup Double cone or double cup made of special steel.
E Cone & Cup Cones or cups having special characteristics differing from and
non-interchangeable with other cones or cups identified with the same
basic part numbers.
ED Cup Double cup. (Non-interchangeable with other cups identified with same basic
part numbers.)
EDC Cup Double cup, special hole in OD for locking pin.
EE Cone Large and small ribs -close guided rollers. (Non-interchangeable with other
cones identified with same basic part numbers.)
EH Cone & Cup Extra heavy series.
EL Cone & Cup Extra light series.
EX Cone & Cup Experimental.
EXX Cone & Cup Cones or cups having special characteristics differing from and
non-interchangeable with other cones or cups identified with the same basic
part numbers. Made of special steel.
F Cone Assembled with polymer cage.
FL Cone & Cup “Free lateral” series, no large or small ribs.
FX Cone & Cup Factory identification number only.
G Cone Retainer groove in bore.
H Cone & Cup Heavy series. (Non-interchangeable with other cones and cups identified with
same basic part numbers.)
H Cone Assembled with special cage, rollers, and/or internal geometry.
(Non-interchangeable with basic part number.)
HV Cone Assembled with special cage, rollers, and/or internal geometry.
Made of special steel. (Non-interchangeable with basic part number.)
HH Cone & Cup Heavy-Heavy series. (Non-interchangeable with other cones and cups
identified with same basic part numbers.)
HM Cone & Cup Heavy-Medium series. (Non-interchangeable with other cones and cups
identified with same basic part numbers.)
HP Cone Assembled with special cage and/or roller, different internal geometry.
Customized for performance. (Non-interchangeable with basic part number.)
HR Cup Special cup used on “Hydra-Rib” bearing. (Non-interchangeable with basic
part number.)
J Cone & Cup Used alone or with other prefix letters to indicate metric bore and/or OD.
JC Cone & Cup Metric Series.
JD Cone & Cup Metric Series.
JE Cone & Cup Metric Series.
JF Cone & Cup Metric Series.
JG Cone & Cup Metric Series.
JN Cone & Cup Metric Series.
JP Cone & Cup Metric Series.
JR Cone & Cup Metric Series.
JRM Cone & Cup Metric Series, UNIPAC™ bearing.
JS Cone & Cup Metric Series.
JT Cone & Cup Metric Series.
JU Cone & Cup Metric Series.
JW Cone & Cup Metric Series.
K Cup Double cup with heavy section. May have unusual feature such as flange.
(Non-interchangeable with basic part number.)

vii

PREFIX SUFFIX CONE OR CUP EXPLANATION
KP Thrust Bearing Cadmium plated.
L Cone & Cup Light series. (Non-interchangeable with other cones and cups identified with
same basic part numbers.)
L Cone Cone assembled with Duo-Face seal.
L Cup Loose rib. (Part of Unit-Bearing.)
LA Cone Cone assembled with Duo-FaceX seal and with “O” ring groove in bore.
LA, LB, Seal These suffixes are used on a basic Duo-Face-Plus seal number to identify the
assembly resulting from the use of the seal various cones in the series.
LL Cone & Cup Light-Light series.
LM Cone & Cup Light-Medium series.
M Cone & Cup Medium series.
N Cone Bock or Gilliam type bearings.
NA NA Cone Two cones mated with double cup to form double row non-adjustable bearing.
(Non-interchangeable with other cones having same basic part numbers
which may vary in bore, OD, and width dimensions.)
NA Cup Etched electric pencil or double cups mated with two “NA” type single cones
to form double row non-adjustable bearings.
NAV Cone “NA” cone made of special steel.
NC Cup Cushioned cup (usually neoprene).
Nl Cup Tapered or threaded bore.
NP Cone & Cup Used with random numbers for product differentiation.
NR Cone “NA” type ribless cone for ribbed cup series.
NW Cone “NA” type cone with slotted front face.
NWV Cone “NA” type cone with slotted front face. Made of special steel.
NX Cone Lapped front face.
P Cone Puller groove.
P Cone & Cup Customized for performance.
R Cone & Cup Gilliam replacement series. (Non-interchangeable with other cones and cups
identified with same basic numbers.)
R Cone & Cup Special feature bearing. (Non-interchangeable with bearings having the same
basic part numbers.)
R Cone & Cup Bock type bearing.
R Cone Basic part number with polymer lubricant.
RB Cup Snap ring on OD.
RC Cone & Cup Special ribbed cup bearing.
RN Various Used with random numbers, not to exceed six (6) digits, for purchased items
that are distributed by Timken.
RR Cone & Cup “Relieved race.”
S Cone & Cup Special feature bearing. (Non-interchangeable with bearings having same
basic part numbers.)
SA Cone & Cup Special feature bearing. (Non-interchangeable with bearings having same
basic part numbers.)
SB Cone Assembled with brass cage. (Non-interchangeable with basic part number.)
SB Cup Flanged cup. (Non-interchangeable with basic part number.)
SC Cone With square bore. (Non-interchangeable with basic part number.)
SD Cone & Cup Double cone with square bore or double cup. (Non-interchangeable with basic
part number.)
SH Cone Special feature bearing, with special cage, rollers, and/or internal geometry.
(Non-interchangeable with bearings having same basic part numbers.)

viii

PREFIX SUFFIX CONE OR CUP EXPLANATION
SL Thrust Bearing Basic part number with polymer lubricant.
SR Cone Different radius from basic part numbers.
SW Cone & Cup Slot or keyway. (Non-interchangeable with bearings having same basic part
numbers.)
SWB Cone Slot or keyway assembled with brass cage. (Non-interchangeable with
bearings having same basic part numbers.)
SWV Cone Slot or keyway made of special steel. (Non-interchangeable with bearings
having same basic part numbers.)
SX Cup Special feature bearing. (Non-interchangeable with bearings having same
basic part numbers.)
T Race Thrust bearing assemblies.
T Cup Double cup with heavy section. May have unusual feature such as flange,
tapered OD, etc.
T Cone Tapered bore. (Non-interchangeable with basic part number.)
T Cup Tapered OD. (Non-interchangeable with basic part number.)
TA Cone Tapered bore “NA” type cone. (Non-interchangeable with basic part number.)
TA Cup Tapered OD. (Non-interchangeable with basic part number.)
TB Cone Tapered bore cone with brass cage. (Non-interchangeable with basic part
number.)
TC Race Thrust bearing assembly.
TC Cone Tapered bore. (Non-interchangeable with basic part number.)
TD Cone Double with tapered bore. (Non-interchangeable with basic part number.)
TDB Cone Double with tapered bore, assembled with brass cages. (Non-interchangeable
with basic part number.)
TDE Cone Double with tapered bore and extended rib. (Non-interchangeable with basic
part number.)
TDG Cone Double with tapered bore, groove in bore. (Non-interchangeable with basic
part number.)
TDGV Cone Double with tapered bore, groove in bore. Made of special steel.
(Non-interchangeable with basic part number.)
TDH Cone Double with tapered bore, special cage, rollers or internal geometry.
(Non-interchangeable with basic part number.)
TDL Cone Double with tapered bore, interlock feature. (Non-interchangeable with basic
part number.)
TDV Cone Double with tapered bore. Made of special steel. (Non-interchangeable with
basic part number.)
TDW Cone Double with tapered bore and slots or keys. (Non-interchangeable with basic
part number.)
TDXX Cone Double with tapered bore. Made of special steel. (Non-interchangeable with
basic part number.)
TE Cone Single, tapered bore, extended large rib. (Non-interchangeable with basic part
number.)
TEV Cone Single, tapered bore, extended large rib. Made of special steel.
(Non-interchangeable with basic part number.)
TL Cone Tapered bore with interlock feature. Non-interchangeable with basic part
number.)
TLE Cone Tapered bore with interlock feature and extended rib. (Non-interchangeable
with basic part number.)
TP Cone Tapered bore cone with puller groove. (Non-interchangeable with basic part
number.)

ix

PREFIX SUFFIX CONE OR CUP EXPLANATION
TPE Cone Tapered bore cone with puller groove, extended large rib.
(Non-interchangeable with basic part number.)
TPV Cone Tapered bore cone. Made of special steel. (Non-interchangeable with basic
part number.)
TW Cone & Cup Tapered bore cone or cup OD with slots or keys. (Non-interchangeable with
basic part number.)
TWE Cone & Cup Tapered bore cone or cup OD with locking keyway in front face, extended
larger rib. (Non-interchangeable with basic part number.)
TXX Cone Tapered bore. Made of special steel. (Non-interchangeable with basic part
number.)
U Cone & Cup Basic series part number, unitized, self-contained.
U Cone & Cup Basic series part number, unitized, self-contained.
US Cone & Cup Special close stand.
V Cone & Cup Special close stand.
V Cone & Cup Made of special steel.
VC Cone Special internal geometry. Made of special steel. (Non-interchangeable with
basic part number.)
VH Cone Special cage, rollers, and/or internal geometry. Made of special steel.
(Non-interchangeable with basic part number.)
W Cone & Cup Slot(s) or keyway(s).
W Thrust Bearing Oil holes in retainer.
WB Cone Slot(s) or keyway(s) with brass cage.
WC Cone Slot(s) or keyway(s).
WD Cone Double cone with slot(s) or keyway(s).
WE Cone & Cup Extended face with slot(s) or keyway(s). (Non-interchangeable with basic part
number.)
WS Cone & Cup Slot(s) or keyway(s).
WV Cone & Cup Slot(s) or keyway(s). Made of special steel.
WXX Cone & Cup Slot(s) or keyway(s). Made of special steel.
X Cone IsoClass part number.
X Cone Slot(s) or keyway(s).
X Cone & Cup Special feature bearing. (Non-interchangeable with bearings having the same
basic part number.)
X Cone & Cup IsoClass bearing with same boundary dimensions as basic part number but
with different internal geometry, yielding increased rating.
XA Cone & Cup Special feature bearing. (Non-interchangeable with bearings having the same
basic part number.)
XAA Cone IsoClass single cone. (Non-interchangeable with bearings having the same
basic part number.)
XAB Cone IsoClass single cone. (Non-interchangeable with bearings having the same
basic part number.)
XB Cone Different bore, width, or radius, from basic part number. Assembled with brass
cage. (Non-interchangeable with basic part number.)
XB Cup Special feature flanged cup. (Non-interchangeable with bearings having the
same basic part number.) (Non-interchangeable with basic part number.)
XC Cone & Cup Limited production bearings to which standard series part numbers have not
been assigned.
XD Cup Double cup, no oil holes or groove.
XD Cone Double cone, different bore or width from basic part numbers.
Double cone, oil holes in large rib.

x

PREFIX SUFFIX CONE OR CUP EXPLANATION
XDXP Cup Double cup, no oil holes or groove, special material and process.
XE Cup Different bore, width, or radius from basic part number.
XGA Cone IsoClass single cone. (Non-interchangeable with bearings having the same
basic part number.)
XGB Cone IsoClass single cone. (Non-interchangeable with bearings having the same
basic part number.)
XP Cone Special steel and process.
XR Crossed roller bearing series.
XS Cone & Cup Different bore, width, or radius from basic part number.
XS Cone Double.
XV Cone & Cup Special feature cone or cup made of special steel.
XW Cone Slotted.
XX Cone & Cup Single cone or single cup. Made of special steel.
Y Cup IsoClass part number.
YD Cup Double cup with oil holes, no groove. (Non-interchangeable with basic part
number.)
YDA Cup Double cup with oil holes, no groove. (Non-interchangeable with bearings
having the same basic part number.)
YDV Cup Double cup with oil holes, no groove. Made of special steel.
YDW Cone Double cup with oil holes, no groove. Slot(s) or keyway(s) in face(s).
YKA Cup IsoClass single cup. (Non-interchangeable with bearings having the same
basic part number.)
YKB Cup IsoClass single cup. (Non-interchangeable with bearings having the same
basic part number.)
YSA Cup IsoClass single cup. (Non-interchangeable with bearings having the same
basic part number.)
Z Cone & Cup Close stand part.

xi

INTRODUCTION
Mounting a bearing with the proper fit helps ensure the bearing will function as desired. In general, the rotating race must be mounted with a tight fit. A loose fit is used on a stationary cone or on a double cup, especially at the floating position. Cups mounted in an aluminum housing must have minimum tight fit of .001 times the cup O.D. For magnesium housings, the minimum tight fit must be .0015 times the cup O.D. The fitting practices listed within this catalog are specific to industrial appli­cations. Automotive bearings require special fitting practices.
Precision bearings require a special fit that depends on the precision class of the bearing used. In addition to the proper fit and bearing alignment, the desired accu­racy of the spindle, cup and cone seat roundness, and square backing shoulders for both the cup and the cone are very critical. Less than desirable spindle runout will likely result if any of these areas are out of tolerance. A complete discussion showing recommended fits, cup seat and cone seat roundness and backing squareness is found in the booklet “Timken Bearings For Machine Tools”.
INCH SYSTEM BEARINGS
INDUSTRIAL FITTING PRACTICES
Rolling mill bearings also require special fitting practices depending on the type of bearing involved. Refer to the Timken booklet “Rolling Mill Bearings” for a complete discussion of fitting practices.

MACHINED SURFACE FINISHES FOR SHAFTS AND HOUSINGS
The cup and cone seats should be smooth and within specified tolerances for size, roundness and taper. Ground finish is usually recommended for shafts when­ever possible. The recommended finish for ground and turned surfaces is as follows:
• Cone seats - ground 63 micro-inches AA (maximum)

(1.6 micrometer).
• Cone seats - turned 125 micro-inches AA (maximum)

(3.2 micrometer).
If the bearing seat finishes are rougher than these lim­its, there is not enough contact area and the fit will loosen easily, especially if the race is pressed on and off several times.
The following tables show machined finishes for shafts and housings and the recommended fitting practice for both inch and metric sizes.
CONE FITTING PRACTICE (inches) CLASS: 4 AND 2 CONES
CONE BORE DEVIATION FROM MINIMUM CONE BORE AND RESULTANT FIT
ROTATING CONE ROTATING OR STATIONARY CONE STATIONARY CONE
Range Tolerance Does not apply to TNASW and Ground Seat Constant Loads With Moderate Shock Unground or Ground Seat Heavy Loads, or High Speed or Shock Unground Seat Moderate Loads, No Shock Ground Seat Moderate Loads, No Shock Unground Seat Sheaves, Wheels, Idlers Hardened and Ground Seat Wheel Spindles
Over Inclusive TNASWE. type bearings. Cone Seat Deviation Resultant Fit Cone Seat Deviation Resultant Fit Cone Seat Deviation Resultant Fit Cone Seat Deviation Resultant Fit Cone Seat Deviation Resultant Fit Cone Seat Deviation Resultant Fit
0 3.0000 0.0000 +0.0005 +0.0015 +0.0010 0.0015T 0.0005T +0.0025 +0.0015 0.0025T 0.0010T +0.0005 0.0000 0.0005T 0.0005L 0.0000 -0.0005 0.0000 0.0010L 0.0000 -0.0005 0.0000 0.0010L -0.0002 -0.0007 0.0002L 0.0012L
3.0000 12.0000 0.0000 +0.0010 +0.0025 +0.0015 0.0025T 0.0005T Use Average Tight +0.0010 0.0000 0.0010T 0.0010L 0.0000 -0.0010 0.0000 0.0020L 0.0000 -0.0010 0.0000 0.0020L -0.0002 -0.0012 0.0002L 0.0022L
12.0000 24.0000 0.0000 +0.0020 +0.0050 +0.0030 0.0050T 0.0010T Cone Fit of 0.0005 in./in. of +0.0020 0.0000 0.0020T 0.0020L 0.0000 -0.0020 0.0000 0.0040L 0.0000 -0.0020 0.0000 0.0040L — — — —
24.0000 36.0000 0.0000 +0.0030 +0.0075 +0.0045 0.0075T 0.0015T Cone Bore +0.0030 0.0000 0.0030T 0.0030L 0.0000 -0.0030 0.0000 0.0060L 0.0000 -0.0030 0.0000 0.0060L — — — —

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