Understanding Tapered Roller Bearings
Understanding Tapered Roller Bearings
Understanding Tapered Roller Bearings
Contents
B A 19
Outer race
(cup)
Inner race
(cone)
Rollers
Fig. 1-1
Components of a single row tapered roller bearing (type TS)
B A 20
Apex
Fig. 1-2
On-apex design results in true rolling motion at all points long the roller body.
B A 21
Fig. 1-3
Designs to support radial and thrust loads in any
combination
Light section
Heavy section
Fig. 1-4
Designs to suit the space available
B A 22
Radial
Seating
force
Thrust
Inner
race
resultant
Outer race
resultant
Thrust
Radial
Seating force
Inner race
resultant
Elliptical
roller-rib
contact
Fig. 1-5
Small seating force against the cone rib keeps rollers aligned
on the raceway.
B A 23
Contact geometry
Standard tapered roller bearings have
components with specific profiles that
result in uniform stress distribution
under normal loading conditions along
the effective roller contact length
(fig. 1-6). For extremely heavy loads
or significant misalignment, or both,
modified profiles can be provided to
minimize geometric stress
concentration at the ends of roller
contact.
Fig. 1-6
Internal roller profiling of components result in uniform
stress distribution under normal loading conditions.
B A 24
Bearing material
Bearing reliability begins with the material from which the
product is made. The material selection can have a dramatic
impact on a bearings ability to meet the application
requirements. Additionally, the heat-treatment process that
accompanies material selection largely dictates durability
by its impact on several bearing characteristics, including
hardness profile, bearing microstructure, final raceway surface
finish and residual stress.
Traditionally, Timken bearings have been produced from lowcarbon, carburizing grades of steel. The introduction of carbon
during manufacture, and the high alloys in the steel, assures the
proper combination of a hard, fatigue-resistant case and a
tough, ductile core (fig. 1-7). Benefits of case-hardened bearings
include:
Fig. 1-7
Hardened case of bearing components provides fatigue
resistance and the ductile core provides toughness.
B A 25
Through-hardened bearings are typically manufactured from high carbon steel grades. Steel with this
high carbon content requires no additional carbon to be added during the heat-treatment process to
achieve the appropriate hardness for bearing applications. Although the uniform hardness found
in through-hardened product can result in rapid crack propagation and lower fatigue life, the likelihood
of a bearing with sufficiently clean material developing a premature crack and propagating may be low
when the application has moderate loading with no impact loads.
It is widely accepted that case-hardened bearings outperform through-hardened bearings in adverse
environmental conditions such as high loading, high temperature, thin lubricant film, heavy press fits and
shock loading. Through-hardened product also requires better raceway surface finishes to achieve the
equivalent lubricating benefits of case-hardened bearings. However, there are applications where
through-hardened products adequately meet performance requirements. Timken offers both casehardened and through-hardened bearings to encourage the selection of the most cost-effective
performance option based on the applications needs.
Bearing performance and life have been extensively studied at The Timken Company (as well as in field
conditions) to determine the best steel composition and heat-treatment combinations. Bearings for normal
service conditions are applicable when:
The maximum Hertzian contact stresses do not exceed 4,000 MPa (580,000 PSI).
B A 26
Polymer cages
Some bearings designed for specific field applications, such as
the UNIPACTM bearing, have polymer cages. Other specialized
bearings, such as crossed roller bearings, use polymer
separators between the rollers instead of a one-piece cage.
Fig. 1-8
Pin type cage for large bearings
TM = Trademark of The Timken Company
B A 27
Fig. 1-9
Bearing equipped with 'L Riding' cage
B A 28
2. Sealed bearings
TSL*
3. Precision bearings
3.1. TS and TSF single row bearings*
3.2. HR - Hydra-RibTM bearing with preload
adjustment device*
3.3. High speed bearings
TSMA - Single row, with axial oil provision
3.4. TXR - Crossed roller bearing*
4. Other two-row bearings
Type TDIE - Extended double cup
Type TDIA
Type TNASWH -TNASWHF non adjustable,
heavy duty, double cone
5. Four-row bearings
Type TQO
Type TQOW
Type TQITS / Type TQITSE
Sealed Work Roll Bearing
6. Heavy duty thrust bearings
Type TTHDSV
Type TTHDSX
Type TTHDFL
7. Other tapered roller bearing types
B A 29
TS
TSF
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
B.Timken bearing types /1. Popular bearing types /1.1. Single row bearings
B A 30
TDO
TDI
TDIT
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
B.Timken bearing types /1. Popular bearing types /1.2. Two-row bearings
B A 31
TNA - non-adjustable*
TNASW - non-adjustable with lubricant slots*
TNASWE - non-adjustable with lubricant slots and extended back face rib*
These three bearing types are all similar to the TDO comprising a one-piece (double) cup and two cones - but the
cone front faces are extended so that they abut, eliminating the
need for a separate cone spacer. Supplied with a built in
clearance to give a standard setting range, as listed, these
bearings provide a solution for many fixed or floating bearing
applications where optimum simplicity of assembly is required.
TNA
TNASW
B.Timken bearing types /1. Popular bearing types /1.2. Two-row bearings
TNASWE
B A 32
2S
B.Timken bearing types /1. Popular bearing types /1.3. Spacer assemblies
B A 33
SR - Set-Right
TM
assembly*
SR
TM = Trademark of The Timken Company
B.Timken bearing types /1. Popular bearing types /1.3. Spacer assemblies
B A 34
2TS-IM
2TS-DM
B.Timken bearing types /1. Popular bearing types /1.3. Spacer assemblies
2TS-TM
B A 35
Unipac
PINION PAC
TM
B.Timken bearing types /1. Popular bearing types /1.4. Package bearings
UNIPAC
B A 36
Unipac-Plus TM
The Unipac-Plus bearing is a ready to install, pre-set, sealed and
lubricated for life two-row assembly with a flanged outer ring. It is a
maintenance-free, heavy vehicle wheel package. The package enables
a reduction in the wheel weight by eliminating the traditional wheel
hub and has the advantage of improving reliability, assembly and
supply logistics. An added advantage for disc brake equipped axles is
ease of mounting of the brake disc.
AP
TM
bearing*
SP
TM
TRUCK
UNIPAC--PLUS
AP
bearing
B.Timken bearing types /1. Popular bearing types /1.4. Package bearings
'SP'
B A 37
TTSP
TTHD
B.Timken bearing types /1. Popular bearing types /1.5. Thrust bearings
B A 38
2. Sealed bearings
TSL*
The TSL incorporates a DUO FACE PLUS seal,
making it an economical choice for grease
lubricated applications at moderate speeds.
TSL
B A 39
3. Precision bearings
3.1. TS and TSF single row bearings*
These bearings are similar in design to the types
described in item 1.1. They are only produced in high
precision quality to be used in machine tool spindles,
printing press cylinders and other applications where
accuracy of rotation is required.
TSHR
B A 40
TSMA
B A 41
TXRDO
B.Timken bearing types /3. Precision bearings/3.4. TXR - Crossed roller bearing*
B A 42
TDIE
TDIE
(Square Bore)
TDIA
B A 43
TNASWF
TNASWHF
B A 44
B A 45
Type TQO
Type TQOW
These pairs of directly mounted bearings comprise two double
cones, two single and one double cup, with an cone spacer and
two cup spacers. These types are used on roll necks of low and
medium speed rolling mills, being applied to the necks with a loose
fit. When the fillet and/or filler rings do not already have
lubrication slots, they are provided in the faces of the bearing
cones (type TQOW). Slots in the cone spacer permit lubricant flow
from the bearing chamber to the roll neck. The cone spacers are
also hardened to minimize face wear.
TQO
TQOW
B A 46
TQITS
TQITSE
B A 47
TTHDSV
TTHDSX
TTHDFL
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
B A 48
B A 49
1. Symbols
d
D
T
B
C
E
r2
=
=
=
=
=
=
=
Timken Contents
r5
r5
r5
r1
r3
r4
r5
B A 50
2. Bearing series
In all the part numbering systems the term bearing series is used to describe bearings having the same
basic internal geometry (i.e. roller size, included cone and cup angle). Any cone (including roller set) can
be matched with any cup within the same series providing that the same type of bearing is being used.
INCH
575
572
576
METRIC
ISO 355
ORIGINAL
ABMA
J-LINE
ORIGINAL METRIC
NEW METRIC
< Individual part number for inner and outer race > < Part number describes inner and outer race >
C. How to recognize your part number/2. Bearing series/3. Inch part numbering systems
B A 51
HM
Section 1
Duty
226
Section 2
Angularity
Section 3
Basic series
indications
49
---
Section 4
Component
designator
Section 5
Modification
suffix
C. How to recognize your part number/3. Inch part numbering systems/3.2. ABMA
B A 52
EL
LL
L
LM
M
Extra Light
Lighter than Light
Light
Light Medium
Medium
HM
H
HH
EH
T
Heavy Medium
Heavy
Heavier than Heavy
Extra Heavy
Thrust only
HM
226
49
C. How to recognize your part number/3. Inch part numbering systems/3.2. ABMA
---
B A 53
Code
to 23 59 59.99
to 25 29 59.99
to 26 59 59.99
to 28 29 59.99
to 30 29 59.99
to 32 29 59.99
to 35 59 59.99
to 44 59 59.99
Up, but not thrust only
Thrust bearing only
1
2
3
4
5
6
7
8
9
0
HM
226
49
C. How to recognize your part number/3. Inch part numbering systems/3.2. ABMA
---
B A 54
Series indication
Maximum
bore range
(inches)
Series indication
0-1
1-2
00 to 19 incl.
20 to 99 incl.
000 to 029 incl.
030 to 129 incl.
130 to 189 incl.
190 to 239 incl.
240 to 289 incl.
290 to 339 incl.
340 to 389 incl.
390 to 429 incl.
430 to 469 incl.
470 to 509 incl.
510 to 549 incl.
550 to 579 incl.
580 to 609 incl.
610 to 639 incl.
15 - 16
16 - 17
17 - 18
18 - 19
19 - 20
20 - 21
21 - 22
22 - 23
23 - 24
24 - 25
25 - 30
30 - 35
35 - 40
40 - 50
50 - 72.5
72.5 and over
2-3
3-4
4-5
5-6
6-7
7-8
8-9
9 - 10
10 - 11
11 - 12
12 - 13
13 - 14
14 - 15
HM
226
49
C. How to recognize your part number/3. Inch part numbering systems/3.2. ABMA
---
B A 55
HM
226
49
C. How to recognize your part number/3. Inch part numbering systems/3.2. ABMA
---
B A 56
Section 5 - Suffix
This will consist of one letter to
three letters in pre-arranged
combinations, indicating
modifications in external form
or internal arrangement.
HM
226
49
C. How to recognize your part number/3. Inch part numbering systems/3.2. ABMA
---
B A 57
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
Cone
Cone
Cone
Cup
Cup
Cup
AA
AB
Cone
Different bore, width or radius from basic part number, assembled with brass cage.
AB
Cup
B A 58
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
AC
Cone
AC
Cup
AD
Cup
ADW
Cone
Double Cone. Pilots and slots each end, holes in large rib.
AH
Cone
AL
Cone
ARB
Cup
AS
ASB
Cone
Single cone, different bore or width from basic part number, assembled with brass
cage.
AV
AW
AX
AXB
Cone
Different bore, width, or radius from basic part number, assembled with brass
cage.
AXD
Cup
AXV
Different OD, width, or radius from basic part number. Made of special steel.
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
B A 59
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
AXX
Different OD, width, or radius from basic part number. Made of special steel.
Cup
Cone
ISO bearing with same boundary dimensions as basic part number, but with
different internal geometry, steeper included cup angle.
BA
Cup
BNA
Cone
ISO cone used in assemblies with 2 cones mated with double cup to form a double
row non-adjusting bearing. (Non-interchangeable with other cones having the same
basic part numbers, which may vary in bore or width dimensions.)
BR
Cup
BS
Cup
BW
Cup
BX
Cup
BXX
Cup
Cone
Single cone, envelope dimensions same as basic part number, different internal
geometry.
Cup
CA
Cone
Single cone, envelope dimensions same as basic part number, different internal
geometry.
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
B A 60
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
CB
Cone
CD
Cup
Double cup with oil holes and groove. One hole counter-bored for locking pin.
CE
Cup
Cup
CP
CP
CR
CS
CX
Cone
DA
Cone
Double cone. (Non-interchangeable with cones having same basic part number.)
DA
Cup
DB
Cup
Double cup with flange. (Non-interchangeable with basic part number or double
cups having same basic numbers.)
DB
Cone
DC
Cup
CN
A. How
C.
Basic totapered
recognize
rolleryour
bearing
part number/3./3.3.
design
Prefixes and Suffixes
B A 61
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
DD
Special long double cone or cup. (Non-interchangeable with basic part number or
other double parts having same basic numbers.)
DE
DF
Cup
Double cup with oil holes and groove. Snap ring groove on OD.
DG
Cone
DGA
Cone
DGE
Cone
DGH
Cone
Double cone with presure removal groove or helical groove in bore and with
special cage, rollers, and/or internal geometry.
DGW
Cone
Double cone with pressure removal groove or helical groove in bore, and having
face slots.
DH
Cone
DP
Cone
DR
Cup
Double cup for ribbed cup series. (Non-interchangeable with single and double
cups identified with same basic part number.)
DRB
Cup
B A 62
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
DS
Cup
DT
Cup
Tapered OD double cup. (Non-interchangeable with other cups having same basic
part numbers.)
DV
DVH
Cone
DW
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.
(Asymmetrical)
DWH
Cone
Double cone with oil slots, assembled with special cage, rollers, and/or internal
geometry.
DWV
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.
DX
Cup
DX
Cup
DXX
Timken Contents
B A 63
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
ED
Cup
Double cups. (Non-interchangeable with other cups identified with same basic part
numbers.)
EDC
Cup
EE
Cone
Large and small ribs - close guided rollers. (Non-interchangeable with other cones
identified with same basic part numbers.)
EH
EL
EX
Experimental.
EXX
Cone
FL
FX
Cone
Heavy series. (Non-interchangeable with other cones and cups identified with same
basic part numbers.)
Cone
HV
Cone
Assembled with special cage, rollers, and/or internal geometry. Made of special steel.
G
H
B A 64
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
HH
HM
HP
Cone
Assembled with special cage and/or roller, different internal geometry. Customized
for performance.
HR
Cup
Used alone or with other prefix letters to indicate metric bore and/or OD.
JC
Metric Series.
JD
Metric Series.
JE
Metric Series.
JF
Metric Series.
JG
Metric Series.
JN
Metric Series.
JP
Metric Series.
JR
Metric Series.
JRM
JS
Metric Series.
B A 65
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
JT
Metric Series.
JU
Metric Series.
JW
Metric Series.
Cup
Double cup with heavy section. May have unusual features such as flange, tapered
OD, etc.
Miscellaneous
K prefix with 5 or 6 digits following also used for miscellaneous components (seals,
bolts, filler rings, etc.)
Thrust Bearing
Cadmium plated.
Light series. (Non-interchangeable with other cones and cups identified with same
basic part numbers.)
Cone
Cup
LA
Cone
LA, LB,
Seal
These suffixes are used on a basic Duo-Face-Plus seal number to identify the
assembly
KP
L
LC, etc.
resulting from the use of the seal with various cones in the series.
LL
Light-Light series.
LM
Light-Medium series.
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
B A 66
PREFIX
SUFFIX
CONE OR CUP
Medium series.
Through hardened components, DIN 720 Part Numbers, IsoClass Part Numbers
Cone
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 on double cups mated with two NA type single cones to
form double row non-adjustable bearings.
NAV
Cone
NC
Cup
NI
Cone
NR
Cone
NW
Cone
NWV
Cone
NX
Cone
Cone
Puller groove.
M
N
NA
EXPLANATION
NP
B A 67
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
Cone
RB
Cup
RN
Various
Used with random numbers, not to exceed six (6) digits, for purchased items that
are distributed by Timken.
RR
Relieved race.
SA
SB
Cone
SB
Cup
Flanged cup.
SC
Cone
SD
RC
B A 68
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
SH
Cone
Special feature bearing, with special cage, rollers, and/or internal geometry.
(Non-interchangeable with bearings having same basic part numbers.)
SL
Thrust Bearing
SR
Cone
SW
SWB
Cone
SWV
Cone
SX
Cup
Race
Cup
Double cup with heavy section. May have unusual feature such as flange, tapered
OD, etc.
Cone
Tapered bore.
Cup
Tapered OD.
TA
Cone
TA
Cup
Tapered OD.
B A 69
PREFIX
SUFFIX
CONE OR CUP
TB
EXPLANATION
Cone
Race
TC
Cone
Tapered bore.
TD
Cone
TDB
Cone
TDE
Cone
TDG
Cone
Double with tapered bore, pressure removal groove or spiral groove in bore.
TDGV
Cone
Double with tapered bore, pressure removal groove or spiral groove in bore. Made
of special steel.
TDH
Cone
TDL
Cone
TDV
Cone
TDW
Cone
TDXX
Cone
TE
Cone
TEV
Cone
TL
Cone
TLE
Cone
TC
B A 70
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
TP
Cone
TPE
Cone
Tapered bore cone with puller groove, extended cone large rib.
TV
TW
TWE
Tapered bore cone or cup OD with locking keyway in front face, extended cone
large rib or cup width.
TXX
Cone
US
VC
Cone
VH
Cone
Slot(s) or keyway(s).
Thrust Bearing
WA
Slot(s) or keyway(s).
WB
Cone
B A 71
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
WC
Slot(s) or keyway(s).
WD
WE
WS
Slot(s) or keyway(s).
WV
WXX
Cone
Cone
Slot(s) or keyway(s).
Special feature bearing. (Non-interchangable with bearings having the same basic
part number.)
ISO bearing with same boundary dimensions as basic part number but with
different internal geometry, yielding increased rating.
XA
XAA
Cone
ISO single cone. (Non-interchangeable with bearings having the same basic part
number.)
XAB
Cone
ISO single cone. (Non-interchangeable with bearings having the same basic
part number.)
Cone
Different bore, width, or radius, from basic part number. Assembled with brass cage.
XB
B A 72
PREFIX
SUFFIX
CONE OR CUP
XB
EXPLANATION
Cup
Special feature flanged cup. (Non-interchangeable with bearings having the same
basic part number.)
Limited production bearings to which standard series part numbers have not been
assigned.
XD
Cup
XD
Cone
XD
Cone
XDXP
Cup
XE
Cup
XGA
Cone
ISO single cone. (Non-interchangeable with bearings having the same basic part
number.)
XGB
Cone
ISO single cone. (Non-interchangeable with bearings having the same basic part
number.)
Cone
XS
XV
XW
Cone
Slotted.
XX
XC
XP
XR
B A 73
PREFIX
SUFFIX
CONE OR CUP
EXPLANATION
Cup
YD
Cup
YDA
Cup
Double cup with oil holes, no groove. (Non-interchangeable with bearings having
the same basic part number.)
YDV
Cup
YDW
Cone
YKA
Cup
ISO single cup. (Non-interchangeable with bearings having the same basic part
number.)
YKB
Cup
ISO single cup. (Non-interchangeable with bearings having the same basic part
number.)
YSA
Cup
ISO single cup. (Non-interchangeable with bearings having the same basic part
number.)
B A 74
J HM
226
Section 3
Basic series
indications
Section 2
Angularity
Section 1
Duty
49
---
Section 4
Component
designator
Section 5
Modification
suffix
C. How to recognize your part number/4 Metric part /4.1. J-Line part numbers
B A 75
303
302
313
323
322
330
320
Diameter
series
1
Width series
Section1
Tapered
roller
bearing
Section 2
Width
series
2
Section 3
Diameter
series
332
331
18
Section 4
Cone bore
designation
C. How to recognize your part number/4 Metric /4.2. ISO Part Numbering System
B A 76
18
C. How to recognize your part number/4 Metric /4.2. ISO Part Numbering System
B A 77
18
C. How to recognize your part number/4 Metric /4.2. ISO Part Numbering System
B A 78
18
C. How to recognize your part number/4 Metric /4.2. ISO Part Numbering System
B A 79
18
C. How to recognize your part number/4 Metric /4.2. ISO Part Numbering System
B A 80
B CD E
B CD E
B CDE
B C D E
Width series
Symbol for
tapered roller
bearings
(optional)
Angle series
designation
Diameter
series
designation
B
Width
series
designation
100
Bearing bore
diameter (mm)
C. How to recognize your part number/4 Metric /4.3. New ISO 355
B A 81
T 4 C B 100
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
C. How to recognize your part number/4 Metric /4.3. New ISO 355
B A 82
1
2
3
4
5
6
7
over
incl.
13 52
15 59'
18 55
23
27
30
T 4 C B 100
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
C. How to recognize your part number/4 Metric /4.3. New ISO 355
B A 83
A
B
C
D
E
F
G
D
d 0.77
over
incl.
3.80
4.40
4.70
5.00
5.60
7.00
T 4 C B 100
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
C. How to recognize your part number/4 Metric /4.3. New ISO 355
B A 84
T
(D d) 0.95
over
incl.
0.68
0.80
0.88
1.00
T 4 C B 100
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
C. How to recognize your part number/4 Metric /4.3. New ISO 355
B A 85
T 4 C B 100
1. UNDERSTANDING TAPERED ROLLER BEARINGS
Timken Contents
C. How to recognize your part number/4 Metric /4.3. New ISO 355
B A 86
J-prefix
Section 1
Duty
100
Section 2
Cone
bore diameter
49
Section 3
Component
designator
C. How to recognize your part number/4 Metric /4.4. New metric bearings
B A 87
J-prefix
All of the new metric bearings are identified
with a J-prefix that indicates a new metric
dimensioned and toleranced bearing.
100
C. How to recognize your part number/4 Metric /4.4. New metric bearings
49
B A 88
Section 1 - Duty
Indicates application type:
C, D & F = general purpose
N = combination of general purpose and pinion
P = high speed
S and T = pinions
W = high axial loads
100
C. How to recognize your part number/4 Metric /4.4. New metric bearings
49
B A 89
100
C. How to recognize your part number/4 Metric /4.4. New metric bearings
49
B A 90
100
C. How to recognize your part number/4 Metric /4.4. New metric bearings
49
B A 91
Raceway
angle
between
(mm)
100
90
80
55
11 30'
and
15 10'
32911
(2BC)
JC5500
(2CC)
32011X
(3CC)
33011
(2CE)
JD5500
(2CD)
33111
(3CE)
120
110
100
32211
(3DC)
Comparison table:
increase in section for a
55 mm bore bearing
55
11 30'
and
15 10'
30211
(3DB)
33211
(3DE)
30311
(2FB)
JF5500
(2ED)
32311
(2FD)
120
110
100
55
18 15'
and 30
JS5500
(5DD)
JP5500
(4CB)
JT5500
(5ED)
JW5500
(7FC)
JN5500
(4FE)
31311
(7FB)
32311B
(5FD)
C. How to recognize your part number/4 Metric /4.4. New metric bearings
B A 92
C. How to recognize your part number/5. Optimum bearing selection: ISO 355
B A 93