Inch 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

0.09375" (2.3813 mm)(5)

0.125" (3.1750 mm)(25)
OD

0.1875" (4.7625 mm)(5)

0.25" (6.3500 mm)(6)

0.3125" (7.9375 mm)(6)

0.375" (9.5250 mm)(10)

0.5" (12.7000 mm)(3)
Width

0.0625" (1.5875 mm)(1)

0.0937" (2.3800 mm)(6)

0.1094" (2.7788 mm)(8)

0.1406" (3.5712 mm)(8)

0.1562" (3.9675 mm)(4)

0.1719" (4.3663 mm)(3)
Static Load

107 lbf(3)

109 lbf(2)

110 lbf(4)

121 lbf(2)

122 lbf(5)

25 lbf(2)

28 lbf(2)

32 lbf(1)

49 lbf(3)

54 lbf(3)

96 lbf(3)

Part Number	Ring Material	ID	OD	Width	Shield Type	Dynamic Load	Static Load	Limited Speed(x1K rpm)
SR133	440C Stainless Steel	0.09375" (2.3813 mm)	0.1875" (4.7625 mm)	0.0625" (1.5875 mm)	Open	32 lbf	10 lbf	72
R133 2rs	52100 Chrome Steel	0.09375" (2.3813 mm)	0.1875" (4.7625 mm)	0.0937" (2.3800 mm)	Sealed	28 lbf	10 lbf	80
SR133 2rs	440C Stainless Steel	0.09375" (2.3813 mm)	0.1875" (4.7625 mm)	0.0937" (2.3800 mm)	Sealed	25 lbf	9 lbf	72
R133zz	52100 Chrome Steel	0.09375" (2.3813 mm)	0.1875" (4.7625 mm)	0.0937" (2.3800 mm)	Shielded	28 lbf	10 lbf	80
SR133zz	440C Stainless Steel	0.09375" (2.3813 mm)	0.1875" (4.7625 mm)	0.0937" (2.3800 mm)	Shielded	25 lbf	9 lbf	72
R144	52100 Chrome Steel	0.125" (3.1750 mm)	0.25" (6.3500 mm)	0.0937" (2.3800 mm)	Open	54 lbf	17 lbf	67
SR144	440C Stainless Steel	0.125" (3.1750 mm)	0.25" (6.3500 mm)	0.0937" (2.3800 mm)	Open	49 lbf	15 lbf	60.3
R144 2rs	52100 Chrome Steel	0.125" (3.1750 mm)	0.25" (6.3500 mm)	0.1094" (2.7788 mm)	Sealed	54 lbf	17 lbf	67
SR144 2rs	440C Stainless Steel	0.125" (3.1750 mm)	0.25" (6.3500 mm)	0.1094" (2.7788 mm)	Sealed	49 lbf	15 lbf	60.3
R144zz	52100 Chrome Steel	0.125" (3.1750 mm)	0.25" (6.3500 mm)	0.1094" (2.7788 mm)	Shielded	54 lbf	17 lbf	67
SR144zz	440C Stainless Steel	0.125" (3.1750 mm)	0.25" (6.3500 mm)	0.1094" (2.7788 mm)	Shielded	49 lbf	15 lbf	60.3
R2	52100 Chrome Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1562" (3.9675 mm)	Open	121 lbf	39 lbf	56
SR2	440C Stainless Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1562" (3.9675 mm)	Open	109 lbf	35 lbf	50.4
R2 2rs	52100 Chrome Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1562" (3.9675 mm)	Sealed	121 lbf	39 lbf	56
SR2 2rs	440C Stainless Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1562" (3.9675 mm)	Sealed	109 lbf	35 lbf	50.4
R2-5	52100 Chrome Steel	0.125" (3.1750 mm)	0.3125" (7.9375 mm)	0.1094" (2.7788 mm)	Open	107 lbf	32 lbf	60
SR2-5	440C Stainless Steel	0.125" (3.1750 mm)	0.3125" (7.9375 mm)	0.1094" (2.7788 mm)	Open	96 lbf	29 lbf	54
R2-5 2rs	52100 Chrome Steel	0.125" (3.1750 mm)	0.3125" (7.9375 mm)	0.1406" (3.5712 mm)	Sealed	107 lbf	32 lbf	60
SR2-5 2rs	440C Stainless Steel	0.125" (3.1750 mm)	0.3125" (7.9375 mm)	0.1406" (3.5712 mm)	Sealed	96 lbf	29 lbf	54
R2-5zz	52100 Chrome Steel	0.125" (3.1750 mm)	0.3125" (7.9375 mm)	0.1406" (3.5712 mm)	Shielded	107 lbf	32 lbf	60
SR2-5zz	440C Stainless Steel	0.125" (3.1750 mm)	0.3125" (7.9375 mm)	0.1406" (3.5712 mm)	Shielded	96 lbf	29 lbf	54
R2-6	52100 Chrome Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1094" (2.7788 mm)	Open	122 lbf	41 lbf	53
SR2-6	440C Stainless Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1094" (2.7788 mm)	Open	110 lbf	37 lbf	47.7
R2-6 2rs	52100 Chrome Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1406" (3.5712 mm)	Sealed	122 lbf	41 lbf	53
SR2-6 2rs	440C Stainless Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1406" (3.5712 mm)	Sealed	110 lbf	37 lbf	47.7
R2-6zz	52100 Chrome Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1406" (3.5712 mm)	Shielded	122 lbf	41 lbf	53
SR2-6zz	440C Stainless Steel	0.125" (3.1750 mm)	0.375" (9.5250 mm)	0.1406" (3.5712 mm)	Shielded	110 lbf	37 lbf	47.7
R2A	52100 Chrome Steel	0.125" (3.1750 mm)	0.5" (12.7000 mm)	0.1719" (4.3663 mm)	Open	122 lbf	41 lbf	53
SR2A	440C Stainless Steel	0.125" (3.1750 mm)	0.5" (12.7000 mm)	0.1719" (4.3663 mm)	Open	110 lbf	37 lbf	47.7
R2A 2rs	52100 Chrome Steel	0.125" (3.1750 mm)	0.5" (12.7000 mm)	0.1719" (4.3663 mm)	Sealed	122 lbf	41 lbf	53

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