Miniature Bearings

Material	Chrome Steel Gcr15
Clearance	C2 C0 C3 C4
Vibration	ZV1 ZV2 ZV3 ZV4
Hardness	HRC60--HRC63
Cage	Steel brass or nylon
Lubrication	Grease or oil
Precision	P0 P6 P5
Seals	ZZ 2RS OPEN

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Bearing No.			Dimension (mm)				Rubber shield	Steel shield	Basic Load Rating		Weight (g)
Bearing No.			Dimension (mm)				Rubber shield	Steel shield	Dynamic	Static	Weight (g)
Open	Shield	Shield contact	d	D	B	r	B1	r1	Cr（N)	Cor（N)	Open	Shield
681	ZZ		1	3	1	0.05	1.5	0.05	80	23	0.08
MR31				3	1.5	0.05			80	23	0.07
691	ZZ			4	1.6	0.1	2.3	0.1	140	36	0.1
MR41X	ZZ		1.2	4	1.8	2.5	0.1	0.1	138	35	0.1	0.14
68/1.5	ZZ		1.5	4	1.2	0.05	2	0.05	112	33	0.07	0.11
69/1.5	ZZ			5	2	0.15	2.6	0.15	240	69	0.17	0.19
60/1.5	ZZ			6	2.5	0.15	3	0.15	330	99	0.31	0.36
672	ZZ		2	4	1.2	0.05	2	0.06	104	37	0.1	0.14
682	ZZ			5	1.5	0.08	2.3	0.08	188	59	0.12	0.17
MR52	ZZ			5	2	0.1	2.5	0.1	188	59	0.16	0.22
692	ZZ			6	2.3	0.15	3	0.15	330	99	0.28	0.38
MR62	ZZ			6	2.5	0.15	2.5	0.15	330	99	0.28	0.33
MR72	ZZ			7	2.5	0.15	3	0.15	385	128	0.43	0.47
602	ZZ			7	2.8	0.15	3.5	0.15	385	128	0.51	0.58
67/2.5	ZZ		2.5	5	1.5	0.08			153	59	0.11	0.11
68/2.5	ZZ			6	1.8	0.08	2.3	0.08	209	73	0.23	0.29
69/2.5	ZZ			7	2.5	0.15	2.6	0.08	385	128	0.4	0.55
MR82X	ZZ			8	2.5	0.2	3.5	0.15	560	179	0.52
60/2.5	ZZ			8	2.8	0.15			560	175	0.63	0.83
673	ZZ		3	6	2	0.08	4	0.15	209	73	0.19	0.28
683	ZZ			7	2	0.1	2.5	0.08	385	129	0.32	0.43
MR83				8	2.5	0.15	3	0.1	560	179	0.51
693	ZZ			8	3	0.15	4	0.15	56	179	0.61	0.83
MR93	ZZ			9	2.5	0.2	4	0.15	640	226	0.68	1.18
603	ZZ			9	3	0.15	5	0.15	640	226	0.84	1.2
623	ZZ			10	4	0.15	4	0.15	615	226	1.65	1.66
633	ZZ			13	5	0.2	5	0.2	1300	485	3.38	3.33
674	ZZ		4	7	2	0.08	2.5	0.08	315	115	0.21	0.29
MR84	ZZ		4	8	2	0.15	3	0.1	395	140	0.33	0.56
684	ZZ		4	9	2.5	0.1	4	0.1	640	226	0.63	1.01
MR104	ZZ			10	3	0.2	4	0.15	650	236	0.95	1.33
694	ZZ	2RS		11	4	0.15	4	0.15	715	283	1.7	1.75
604	ZZ	2RS		12	4	0.2	4	0.2	970	360	2.25	2.29
624	ZZ	2RS		13	5	0.2	5	0.2	1300	485	2.97	3.04
634	ZZ	2RS		16	5	0.3	5	0.3	1740	670	5	5.21
675	ZZ		5	8	2	0.08	2.5	0.08	278	131	0.25	0.34
MR95	ZZ			9	2.5	0.15	3	0.15	435	168	0.48	0.54
MR105	ZZ			10	3	0.15	4	0.15	435	168	0.9	1.29
685	ZZ	2RS		11	3	0.15	5	0.15	715	283	1.2	1.95
695	ZZ	2RS		13	4	0.2	4	0.2	1080	430	2.4	2.5
605	ZZ	2RS		14	5	0.2	5	0.2	1330	505	3.54	4
625	ZZ	2RS		16	5	0.3	5	0.3	1730	670	4.95	6
635	ZZ	2RS		19	6	0.3	6	0.3	2620	1060	8.53	9
675	ZZ		6	10	2.5	0.1	3	0.1	495	219	0.53	0.9
MR126	ZZ			12	3	0.2	4	0.15	715	292	1.2	1.6
686	ZZ	2RS		13	3.5	0.15	5	0.15	1080	440	1.9	2.5
696	ZZ	2RS		15	5	0.2	5	0.2	1740	670	3.79	3.9
606	ZZ	2RS		17	6	0.3	6	0.3	2260	840	5.94	6
626	ZZ	2RS		19	6	0.3	6	0.3	2620	1060	7.97	8
636	ZZ	2RS		22	7	0.3	7	0.3	3300	1360	13	13
677	ZZ		7	11	2.5	0.1	3	0.1	455	201	0.59	0.71
MR137	ZZ			13	3	0.2	4	0.15	830	375	1.5	1.98
687	ZZ	2RS		14	3.5	0.15	5	0.15	1170	510	2	2.97
697	ZZ	2RS		17	5	0.3	5	0.3	1610	715	4.8	5.01
607	ZZ	2RS		19	6	0.3	6	0.3	2620	1060	7.67	8
627	ZZ	2RS		22	7	0.3	7	0.3	3300	1360	12	12
637	ZZ	2RS		26	9	0.3	9	0.3	4000	1580	24	25
678	ZZ		8	12	2.5	0.1	3.5	0.1	535	271	0.7	0.95
MR148	ZZ			14	3.5	0.2	4	0.15	820	385	1.9	2.12
688	ZZ	2RS		16	4	0.2	5	0.2	1250	590	3	3.7
698	ZZ	2RS		19	6	0.3	6	0.3	2240	905	7.18	7.2
608	ZZ	2RS		22	7	0.3	7	0.3	3300	1360	12	12
628	ZZ	2RS		24	8	0.3	8	0.3	3350	1410	17	17.3
638	ZZ	2RS		28	9	0.3	9	0.3	4550	1970	27	28.6
679	ZZ		9	14	3	0.1	4.5	0.1	930	470	1.35	1.98
689	ZZ	2RS		17	4	0.2	5	0.2	1730	810	3.53	4.43
699	ZZ	2RS		20	6	0.3	6	0.3	2120	985	8.33	8.45
609	ZZ	2RS		24	7	0.3	7	0.3	3350	1410	14.5	14.6
629	ZZ	2RS		26	8	0.3	8	0.3	4550	1970	19.5	20
639	ZZ	2RS		30	10	0.6	10	0.6	5100	2390	34	36

Bearing No.

Bore

Outer diameter

Width

B(Open)

B(Closed)

Open

Shield

Seal contact

Snap groove

Snap ring

2RS

1/8

3.175

3/8

9.52

5/32

3.969

5/32

3.969

R2A

2RS

1/8

3.175

1/2

12.7

11/64

4.366

11/64

4.366

2RS

3/16

4.763

1/2

12.7

5/32

3.969

0.196

4.978

R3A

2RS

3/16

4.763

1/2

12.7

0.196

4.978

0.196

4.978

2RS

1/4

6.35

5/8

15.875

0.196

4.978

9/32

4.978

R4A

2RS

1/4

6.35

3/4

19.05

7/32

5.556

9/32

7.144

2RS

3/8

9.525

7/8

22.225

7/32

5.556

5/16

7.144

2RS

1/2

12.7

1-1/8

28.575

1/4

6.35

11/32

7.938

R10

2RS

5/8

15.875

1-3/8

34.925

9/32

7.144

7/16

8.731

R12

2RS

3/4

19.05

1-5/8

41.275

5/16

7.938

7/16

11.113

R13

2RS

3/4

19.05

1-3/4

44.45

3/8

9.525

1/2

11.113

R14

2RS

7/8

22.225

1-7/8

47.625

3/8

9.525

1/2

12.7

R16

2RS

25.4

50.8

3/8

9.525

1/2

12.7

R18

2RS

1-1/8

28.375

2-1/8

53.975

3/8

9.525

1/2

12.7

R20

2RS

1-1/4

31.75

2-1/4

57.15

3/8

9.525

1/2

12.7

R22

2RS

1-3/8

34.925

2-1/2

76.2

7/16

11.113

9/16

14.288

R24

2RS

1-1/2

38.1

2-5/8

66.675

7/16

11.113

9/16

14.288

Tolerance Class

Standard	Tolerance class
GB/T307.1	PO	P6	P5	P4
IS0492	C LASSO	CLASS6	CLASS5	CLASS4
AFBMA STD.20	ABEC1	ABEC3	ABEC5	ABEC7

Bearing Material

Chrome Steel: Chemical Composition of Chrome Steel

Steel No	Chemical Composition%
Steel No	C	Si	Mn	P	S	Cr
Gcr15	0.95-1.05	0.15-0.35	0.20-0.40	≤0.027	≤0.02	1.30-1.65

The Interchange of Chrome Steel No.

Country	China	ISO	U.S.A	Germany	Japan	Sweden
Bearings Steel No.	Gcr15	638/XVII 1	(AISI)52100	(DIN)100Cr6	(Jis)SVJ2	SKF3

Bearing No.			Dimension (mm)				Rubber shield	Steel shield	Basic Load Rating		Weight (g)
Bearing No.			Dimension (mm)				Rubber shield	Steel shield	Dynamic	Static	Weight (g)
Open	Shield	Shield contact	d	D	B	r	B1	r1	Cr（N)	Cor（N)	Open	Shield
681	ZZ		1	3	1	0.05	1.5	0.05	80	23	0.08
MR31				3	1.5	0.05			80	23	0.07
691	ZZ			4	1.6	0.1	2.3	0.1	140	36	0.1
MR41X	ZZ		1.2	4	1.8	2.5	0.1	0.1	138	35	0.1	0.14
68/1.5	ZZ		1.5	4	1.2	0.05	2	0.05	112	33	0.07	0.11
69/1.5	ZZ			5	2	0.15	2.6	0.15	240	69	0.17	0.19
60/1.5	ZZ			6	2.5	0.15	3	0.15	330	99	0.31	0.36
672	ZZ		2	4	1.2	0.05	2	0.06	104	37	0.1	0.14
682	ZZ			5	1.5	0.08	2.3	0.08	188	59	0.12	0.17
MR52	ZZ			5	2	0.1	2.5	0.1	188	59	0.16	0.22
692	ZZ			6	2.3	0.15	3	0.15	330	99	0.28	0.38
MR62	ZZ			6	2.5	0.15	2.5	0.15	330	99	0.28	0.33
MR72	ZZ			7	2.5	0.15	3	0.15	385	128	0.43	0.47
602	ZZ			7	2.8	0.15	3.5	0.15	385	128	0.51	0.58
67/2.5	ZZ		2.5	5	1.5	0.08			153	59	0.11	0.11
68/2.5	ZZ			6	1.8	0.08	2.3	0.08	209	73	0.23	0.29
69/2.5	ZZ			7	2.5	0.15	2.6	0.08	385	128	0.4	0.55
MR82X	ZZ			8	2.5	0.2	3.5	0.15	560	179	0.52
60/2.5	ZZ			8	2.8	0.15			560	175	0.63	0.83
673	ZZ		3	6	2	0.08	4	0.15	209	73	0.19	0.28
683	ZZ			7	2	0.1	2.5	0.08	385	129	0.32	0.43
MR83				8	2.5	0.15	3	0.1	560	179	0.51
693	ZZ			8	3	0.15	4	0.15	56	179	0.61	0.83
MR93	ZZ			9	2.5	0.2	4	0.15	640	226	0.68	1.18
603	ZZ			9	3	0.15	5	0.15	640	226	0.84	1.2
623	ZZ			10	4	0.15	4	0.15	615	226	1.65	1.66
633	ZZ			13	5	0.2	5	0.2	1300	485	3.38	3.33
674	ZZ		4	7	2	0.08	2.5	0.08	315	115	0.21	0.29
MR84	ZZ		4	8	2	0.15	3	0.1	395	140	0.33	0.56
684	ZZ		4	9	2.5	0.1	4	0.1	640	226	0.63	1.01
MR104	ZZ			10	3	0.2	4	0.15	650	236	0.95	1.33
694	ZZ	2RS		11	4	0.15	4	0.15	715	283	1.7	1.75
604	ZZ	2RS		12	4	0.2	4	0.2	970	360	2.25	2.29
624	ZZ	2RS		13	5	0.2	5	0.2	1300	485	2.97	3.04
634	ZZ	2RS		16	5	0.3	5	0.3	1740	670	5	5.21
675	ZZ		5	8	2	0.08	2.5	0.08	278	131	0.25	0.34
MR95	ZZ			9	2.5	0.15	3	0.15	435	168	0.48	0.54
MR105	ZZ			10	3	0.15	4	0.15	435	168	0.9	1.29
685	ZZ	2RS		11	3	0.15	5	0.15	715	283	1.2	1.95
695	ZZ	2RS		13	4	0.2	4	0.2	1080	430	2.4	2.5
605	ZZ	2RS		14	5	0.2	5	0.2	1330	505	3.54	4
625	ZZ	2RS		16	5	0.3	5	0.3	1730	670	4.95	6
635	ZZ	2RS		19	6	0.3	6	0.3	2620	1060	8.53	9
675	ZZ		6	10	2.5	0.1	3	0.1	495	219	0.53	0.9
MR126	ZZ			12	3	0.2	4	0.15	715	292	1.2	1.6
686	ZZ	2RS		13	3.5	0.15	5	0.15	1080	440	1.9	2.5
696	ZZ	2RS		15	5	0.2	5	0.2	1740	670	3.79	3.9
606	ZZ	2RS		17	6	0.3	6	0.3	2260	840	5.94	6
626	ZZ	2RS		19	6	0.3	6	0.3	2620	1060	7.97	8
636	ZZ	2RS		22	7	0.3	7	0.3	3300	1360	13	13
677	ZZ		7	11	2.5	0.1	3	0.1	455	201	0.59	0.71
MR137	ZZ			13	3	0.2	4	0.15	830	375	1.5	1.98
687	ZZ	2RS		14	3.5	0.15	5	0.15	1170	510	2	2.97
697	ZZ	2RS		17	5	0.3	5	0.3	1610	715	4.8	5.01
607	ZZ	2RS		19	6	0.3	6	0.3	2620	1060	7.67	8
627	ZZ	2RS		22	7	0.3	7	0.3	3300	1360	12	12
637	ZZ	2RS		26	9	0.3	9	0.3	4000	1580	24	25
678	ZZ		8	12	2.5	0.1	3.5	0.1	535	271	0.7	0.95
MR148	ZZ			14	3.5	0.2	4	0.15	820	385	1.9	2.12
688	ZZ	2RS		16	4	0.2	5	0.2	1250	590	3	3.7
698	ZZ	2RS		19	6	0.3	6	0.3	2240	905	7.18	7.2
608	ZZ	2RS		22	7	0.3	7	0.3	3300	1360	12	12
628	ZZ	2RS		24	8	0.3	8	0.3	3350	1410	17	17.3
638	ZZ	2RS		28	9	0.3	9	0.3	4550	1970	27	28.6
679	ZZ		9	14	3	0.1	4.5	0.1	930	470	1.35	1.98
689	ZZ	2RS		17	4	0.2	5	0.2	1730	810	3.53	4.43
699	ZZ	2RS		20	6	0.3	6	0.3	2120	985	8.33	8.45
609	ZZ	2RS		24	7	0.3	7	0.3	3350	1410	14.5	14.6
629	ZZ	2RS		26	8	0.3	8	0.3	4550	1970	19.5	20
639	ZZ	2RS		30	10	0.6	10	0.6	5100	2390	34	36

Bearing No.

Bore

Outer diameter

Width

B(Open)

B(Closed)

Open

Shield

Seal contact

Snap groove

Snap ring

2RS

1/8

3.175

3/8

9.52

5/32

3.969

5/32

3.969

R2A

2RS

1/8

3.175

1/2

12.7

11/64

4.366

11/64

4.366

2RS

3/16

4.763

1/2

12.7

5/32

3.969

0.196

4.978

R3A

2RS

3/16

4.763

1/2

12.7

0.196

4.978

0.196

4.978

2RS

1/4

6.35

5/8

15.875

0.196

4.978

9/32

4.978

R4A

2RS

1/4

6.35

3/4

19.05

7/32

5.556

9/32

7.144

2RS

3/8

9.525

7/8

22.225

7/32

5.556

5/16

7.144

2RS

1/2

12.7

1-1/8

28.575

1/4

6.35

11/32

7.938

R10

2RS

5/8

15.875

1-3/8

34.925

9/32

7.144

7/16

8.731

R12

2RS

3/4

19.05

1-5/8

41.275

5/16

7.938

7/16

11.113

R13

2RS

3/4

19.05

1-3/4

44.45

3/8

9.525

1/2

11.113

R14

2RS

7/8

22.225

1-7/8

47.625

3/8

9.525

1/2

12.7

R16

2RS

25.4

50.8

3/8

9.525

1/2

12.7

R18

2RS

1-1/8

28.375

2-1/8

53.975

3/8

9.525

1/2

12.7

R20

2RS

1-1/4

31.75

2-1/4

57.15

3/8

9.525

1/2

12.7

R22

2RS

1-3/8

34.925

2-1/2

76.2

7/16

11.113

9/16

14.288

R24

2RS

1-1/2

38.1

2-5/8

66.675

7/16

11.113

9/16

14.288

Tolerance Class

Standard	Tolerance class
GB/T307.1	PO	P6	P5	P4
IS0492	C LASSO	CLASS6	CLASS5	CLASS4
AFBMA STD.20	ABEC1	ABEC3	ABEC5	ABEC7

Bearing Material

Chrome Steel: Chemical Composition of Chrome Steel

Steel No	Chemical Composition%
Steel No	C	Si	Mn	P	S	Cr
Gcr15	0.95-1.05	0.15-0.35	0.20-0.40	≤0.027	≤0.02	1.30-1.65

The Interchange of Chrome Steel No.

Country	China	ISO	U.S.A	Germany	Japan	Sweden
Bearings Steel No.	Gcr15	638/XVII 1	(AISI)52100	(DIN)100Cr6	(Jis)SVJ2	SKF3

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