Bearing number

A bearing number is composed of a basic number and a supplementary code, denoting bearing specifications including bearing type, boundary dimensions, running accuracy, and internal clearance.
Bearing numbers of standard bearings corresponding to JIS B 1512 "rolling bearing boundary dimensions" are prescribed in JIS B 1513.
As well as these bearing numbers, JTEKT uses supplementary codes other than those provided by JIS.
Among basic numbers, bearing series codes are listed in Table 6-1 Bearing series code, and the composition of bearing numbers is described in Table 6-2 Bearing number configuration, showing the order of arrangement of the parts.

[Examples of bearing numbers]

a_54_001.png
a_54_002.png
a_54_003.png
a_54_004.png
a_54_005.png
a_54_006.png

Table 6-1 Bearing series code

Bearing typeBearing series codeType codeDimension series code
Width series1)Diameter series
Single-row deep groove ball bearing 67 6 (1) 7
68 6 (1) 8
69 6 (1) 9
1602) 6 (0) 0
60 6 (1) 0
62 6 (0) 2
63 6 (0) 3
64 6 (0) 4
Double-row deep groove ball bearing
(with filling slot)
42 4 (2) 2
43 4 (2) 3
Single-row angular contact ball bearing 79 7 (1) 9
70 7 (1) 0
72 7 (0) 2
73 7 (0) 3
74 7 (0) 4
Double-row angular contact ball bearing
(with filling slot)
32 (0) 3 2
33 (0) 3 3
Double-row angular contact ball bearing 52 5 (3) 2
53 5 (3) 3
Self-aligning ball bearing 12 1 (0) 2
22 2 (2) 2
13 1 (0) 3
23 2 (2) 3
1122) 1 (0)3) 2
1132) 1 (0)3) 3
Single-row cylindrical roller bearing NU 10 NU4) 1 0
NU 2 NU4) (0) 2
NU 22 NU4) 2 2
NU 32 NU4) 3 2
NU 3 NU4) (0) 3
NU 23 NU4) 2 3
NU 4 NU4) (0) 4
Double-row cylindrical roller bearing NNU 49 NNU 4 9
NN 30 NN 3 0
Single-row needle roller bearing NA 48 NA 4 8
NA 49 NA 4 9
NA 59 NA 5 9
Double-row needle roller bearing NA 69 NA 6 9
Tapered roller bearing 329 3 2 9
320 3 2 0
330 3 3 0
331 3 3 1
302 3 0 2
322 3 2 2
332 3 3 2
303 3 0 3
313 3 1 3
323 3 2 3
Spherical roller bearing 239 2 3 9
230 2 3 0
240 2 4 0
231 2 3 1
241 2 4 1
222 2 2 2
232 2 3 2
2132) 2 0 3
223 2 2 3
Single direction thrust ball bearing 511 5 1 1
512 5 1 2
513 5 1 3
514 5 1 4
Single direction thrust ball bearing with spherical back face 532 5 3 2
533 5 3 3
534 5 3 4
Double direction thrust ball bearing 522 5 2 2
523 5 2 3
524 5 2 4
Double direction thrust ball bearing with spherical back faces 542 5 4 2
543 5 4 3
544 5 4 4
Spherical thrust roller bearing 292 2 9 2
293 2 9 3
294 2 9 4

[Notes]
1) Width series codes in parentheses are omitted in bearing series codes.
2) These are bearing series codes customarily used.
3) Nominal outer ring width series (inner rings only are wide).
4) Besides NU type, NJ, NUP, N, NF, and NH are provided.

Table 6-2 Bearing number configuration

Basic numberSupplementary code
Bearing series
code
Bore diameter
No.
Contact angle
code
Internal design code,
cage guide code
Shield/seal
code
Ring shape code,
lubrication
hole/groove code
Material code,
special treatment code
Matched pair or stack code, cage guide codeInternal clearance
code, preload code
Spacer
code
Cage material/type codeTolerance code (JIS)Grease code
Codesdescriptions
68 Deep groove ball bearing
69 a_56_001.png
60 a_56_001.png
a_56_001.png a_56_001.png
(For standard bearing code,
refer to Table 6-1)
Codesdescriptions
/0.6 0.6mm (Bore diameter)
1 1
/1.5 1.5
2 2
/2.5 2.5
3 3
a_56_001.png a_56_001.png
9 9
00 10
01 12
02 15
03 17
04 20
/22 22
05 25
/28 28
06 30
/32 32
07 35
a_56_001.png a_56_001.png
96 480
/500 500
/530 530
a_56_001.png a_56_001.png
/2500 2500
á Bore diameters (mm) of bearing in the bore diameter range 04 to 96 can be obtained by multiplying their bore diameter number by five.
Codesdescriptions
Angular contact ball bearing
A (omitted) 30°
AC 25°
B 40°
C 15°
CA 20°
E 35°
Tapered roller bearing
B (omitted) Less than 17°
C 20°
D 28° 30'
DJ 28° 48' 39"
Codesdescriptions
R High load capacity (Deep groove ball bearing, cylindrical roller bearing, tapered roller bearing)
G Equal stand-out is provided on both sides of the ring of angular contact ball bearing
(In general, C2 clearance is used)
GST Angular contact ball bearing described above with standard internal clearance provided
J Tapered roller bearing, whose outer ring width, contact angle and outer ring small inside diameter conform to ISO standards
Spherical roller bearings
R With convex asymmetric rollers and machined cage
RH With convex symmetric rollers and pressed cage
RHA With convex symmetric rollers and one-piece machined cage
V Full complement type ball or roller bearing (with no cage)
Codesdescriptions
(Shield)
Z one side Fixed shield
ZZ both sides Fixed shield
ZX one side Removable shield
ZZX both sides Removable shield
(Non-contact seal)
RU one side
2RU both sides
ZU one side
2ZU both sides
(Contact seal)
RS one side
2RS both sides
RK one side
2RK both sides
U one side
UU both sides
(Extremely light contact seal)
RD one side
2RD both sides
Codesdescriptions
K Inner ring tapered bore provided
(1:12)
K30 Inner ring tapered bore provided
(1:30)
N Snap ring groove on outer ring outside surface provided
NR Snap ring groove and locating snap ring on outer ring outside surface provided
NY Creep prevention synthetic resin ring on outer ring outside surface provided
SG Spiral groove on inner ring bore surfaceprovided
W Lubrication hole and lubrication groove on cylindrical roller bearing outer ring outside surface provided
W33 Lubrication hole and lubrication groove on spherical roller bearing outer ring outside surface provided
Codesdescriptions
Code not given High carbon chrome bearing steel
E Case carburizing steel
F Case carburizing steel
H Case carburizing steel
Y Case carburizing steel
ST Stainless steel
SH Special heat treatment
(Dimension stabilizing treatment)
S0 Up to 150℃
S1 Up to 200℃
S2 Up to 250℃
Codesdescriptions
(Angular contact ball bearing)
DB Back-to-back arrangement
DF Face-to-face arrangement
DT Tandem arrangement
(Ball bearing)
PA With outer ring guide cage
(Roller bearing)
Q3 With roller guide cage
Codesdescriptions
(Radial internal clearance for radial bearing)
C1 Smaller than C2
C2 Smaller than standard clearance
CN Standard clearance
C3 Greater than standard clearance
C4 Greater than C3
C5 Greater than C4
(Radial internal clearance for extra-small/miniature ball bearing)
M1 0~5μm
M2 3~8μm
M3 5~10μm
M4 8~13μm
M5 13~20μm
M6 20~28μm
(Radial internal clearance for double-row angular contact ball bearing)
CD2 Smaller than standard clearance
CDN Standard clearance
CD3 Greater than standard clearance
(Deep groove ball bearing)
CM Radial internal clearance for electric
CT motor bearing
NA Non-interchangeable cylindrical roller bearing radial internal clearance (C1NA to C5NA)
(Preload for angular contact ball bearing)
S Slight preload
L Light preload
M Medium preload
H Heavy preload
Codesdescriptions
(Spacer width (mm) is affixed to the end of each code.)
(Deep groove ball bearing)
Inner and outer ring spacers provided
(Angular contact ball bearing)
/ spacers provided
/P Outer ring spacer provided
/S Inner ring spacer provided
(Cylindrical roller bearing, spherical roller bearing)
+DP Inner and outer ring spacers provided
+IDP Inner ring spacer provided
+0DP Outer ring spacer provided
Codesdescriptions
(Pressed cage)
// Steel sheet
YS Stainless steel sheet
(Machined cage)
FT Phenol resin
FY High-tensile brass casting
FW High-tensile brass casting
(separable type)
(Molded cage)
NG Polyamide
FG Polyamide
(Pin type cage)
FP Carbon steel
Codesdescriptions
(JIS)
Omitted Class 0
P6 Class 6
P6X Class 6X
P5 Class 5
P4 Class 4
P2 Class 2
Codesdescriptions
A2 Alvania 2
AC Andok C
B5 Beacon 325
SR Multemp SRL

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