Metric Standard

Miniature bearings are sometimes referred to as instrument bearings and are used in applications as varied as gyros, anemometers, flow meters, miniature gearboxes, small motors and radio controlled models. Miniature ball bearings can be open or shielded, which helps prevent dirt from entering and lubricant from leaking out, and unflanged or flanged for easier plate mounting. Some miniature ball bearing options feature extended inner rings to help fit certain locking devices when a press fit is not possible

FILTERS

ID

8 mm (0.3150 in)(11)

9 mm (0.3543 in)(19)
OD

12 mm (0.4724 in)(6)

14 mm (0.5512 in)(5)

17 mm (0.6693 in)(1)

24 mm (0.9449 in)(6)

26 mm (1.0236 in)(6)

30 mm (1.1811 in)(6)
Width

10 mm (0.3937 in)(6)

2.5 mm (0.0984 in)(2)

3.5 mm (0.1378 in)(6)

4 mm (0.1575 in)(3)

5 mm (0.1969 in)(1)

7 mm (0.2756 in)(6)

8 mm (0.3150 in)(6)
Static Load

1015 N(1)

2568 N(3)

2853 N(3)

3491 N(3)

3564 N(3)

3879 N(3)

3960 N(3)

416 N(3)

462 N(3)

626 N(3)

695 N(2)

Part Number	Ring Material	ID	OD	Width	Shield Type	Dynamic Load	Static Load	Limited Speed(x1K rpm)
SMR148	440C Stainless Steel	8 mm (0.3150 in)	14 mm (0.5512 in)	3.5 mm (0.1378 in)	Open	626 N	278 N	34.2
MR148	52100 Chrome Steel	8 mm (0.3150 in)	14 mm (0.5512 in)	3.5 mm (0.1378 in)	Open	695 N	309 N	38
SMR128zz	440C Stainless Steel	8 mm (0.3150 in)	12 mm (0.4724 in)	3.5 mm (0.1378 in)	Shielded	416 N	197 N	36
MR128zz	52100 Chrome Steel	8 mm (0.3150 in)	12 mm (0.4724 in)	3.5 mm (0.1378 in)	Shielded	462 N	219 N	40
SMR128 2rs	440C Stainless Steel	8 mm (0.3150 in)	12 mm (0.4724 in)	3.5 mm (0.1378 in)	Sealed	416 N	197 N	36
MR128 2rs	52100 Chrome Steel	8 mm (0.3150 in)	12 mm (0.4724 in)	3.5 mm (0.1378 in)	Sealed	462 N	219 N	40
SMR128	440C Stainless Steel	8 mm (0.3150 in)	12 mm (0.4724 in)	2.5 mm (0.0984 in)	Open	416 N	197 N	36
MR128	52100 Chrome Steel	8 mm (0.3150 in)	12 mm (0.4724 in)	2.5 mm (0.0984 in)	Open	462 N	219 N	40
629	52100 Chrome Steel	9 mm (0.3543 in)	26 mm (1.0236 in)	8 mm (0.3150 in)	Open	3879 N	1586 N	28
S609zz	440C Stainless Steel	9 mm (0.3543 in)	24 mm (0.9449 in)	7 mm (0.2756 in)	Shielded	2568 N	1040 N	28.8
609zz	52100 Chrome Steel	9 mm (0.3543 in)	24 mm (0.9449 in)	7 mm (0.2756 in)	Shielded	2853 N	1155 N	32
S609 2rs	440C Stainless Steel	9 mm (0.3543 in)	24 mm (0.9449 in)	7 mm (0.2756 in)	Sealed	2568 N	1040 N	28.8
609 2rs	52100 Chrome Steel	9 mm (0.3543 in)	24 mm (0.9449 in)	7 mm (0.2756 in)	Sealed	2853 N	1155 N	32
609	52100 Chrome Steel	9 mm (0.3543 in)	24 mm (0.9449 in)	7 mm (0.2756 in)	Open	2853 N	1155 N	32
S609	440C Stainless Steel	9 mm (0.3543 in)	24 mm (0.9449 in)	7 mm (0.2756 in)	Open	2568 N	1040 N	28.8
SMR148zz	440C Stainless Steel	8 mm (0.3150 in)	14 mm (0.5512 in)	4 mm (0.1575 in)	Shielded	626 N	278 N	34.2
MR148zz	52100 Chrome Steel	8 mm (0.3150 in)	14 mm (0.5512 in)	4 mm (0.1575 in)	Shielded	695 N	309 N	38
SMR148 2rs	440C Stainless Steel	8 mm (0.3150 in)	14 mm (0.5512 in)	4 mm (0.1575 in)	Sealed	626 N	278 N	34.2
639zz	52100 Chrome Steel	9 mm (0.3543 in)	30 mm (1.1811 in)	10 mm (0.3937 in)	Shielded	3960 N	1664 N	24
S639 2rs	440C Stainless Steel	9 mm (0.3543 in)	30 mm (1.1811 in)	10 mm (0.3937 in)	Sealed	3564 N	1498 N	21.6
S639	440C Stainless Steel	9 mm (0.3543 in)	30 mm (1.1811 in)	10 mm (0.3937 in)	Open	3564 N	1498 N	21.6
639 2rs	52100 Chrome Steel	9 mm (0.3543 in)	30 mm (1.1811 in)	10 mm (0.3937 in)	Sealed	3960 N	1664 N	24
639	52100 Chrome Steel	9 mm (0.3543 in)	30 mm (1.1811 in)	10 mm (0.3937 in)	Open	3960 N	1664 N	24
S629zz	440C Stainless Steel	9 mm (0.3543 in)	26 mm (1.0236 in)	8 mm (0.3150 in)	Shielded	3491 N	1427 N	25.2
629zz	52100 Chrome Steel	9 mm (0.3543 in)	26 mm (1.0236 in)	8 mm (0.3150 in)	Shielded	3879 N	1586 N	28
S629 2rs	440C Stainless Steel	9 mm (0.3543 in)	26 mm (1.0236 in)	8 mm (0.3150 in)	Sealed	3491 N	1427 N	25.2
629 2rs	52100 Chrome Steel	9 mm (0.3543 in)	26 mm (1.0236 in)	8 mm (0.3150 in)	Sealed	3879 N	1586 N	28
S629	440C Stainless Steel	9 mm (0.3543 in)	26 mm (1.0236 in)	8 mm (0.3150 in)	Open	3491 N	1427 N	25.2
S639zz	440C Stainless Steel	9 mm (0.3543 in)	30 mm (1.1811 in)	10 mm (0.3937 in)	Shielded	3564 N	1498 N	21.6
S689 2rs	440C Stainless Steel	9 mm (0.3543 in)	17 mm (0.6693 in)	5 mm (0.1969 in)	Sealed	1015 N	481 N	32.4

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