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

0.1875" (4.7625 mm)(20)

0.3125" (7.9375 mm)(4)

0.375" (9.5250 mm)(6)
OD

0.3125" (7.9375 mm)(6)

0.375" (9.5250 mm)(6)

0.5" (12.7000 mm)(8)

0.625" (15.8750 mm)(4)

0.875" (22.2250 mm)(6)
Width

0.1094" (2.7788 mm)(2)

0.125" (3.1750 mm)(10)

0.1562" (3.9675 mm)(6)

0.196" (4.9784 mm)(6)

0.2188" (5.5575 mm)(2)

0.2812" (7.1425 mm)(4)
Static Load

104 lbf(2)

122 lbf(3)

136 lbf(3)

224 lbf(2)

249 lbf(2)

255 lbf(1)

283 lbf(1)

300 lbf(1)

333 lbf(1)

574 lbf(3)

62 lbf(3)

638 lbf(3)

69 lbf(3)

94 lbf(2)

Part Number	Ring Material	ID	OD	Width	Shield Type	Dynamic Load	Static Load	Limited Speed(x1K rpm)
R1810 2rs	52100 Chrome Steel	0.3125" (7.9375 mm)	0.5" (12.7000 mm)	0.1562" (3.9675 mm)	Sealed	104 lbf	50 lbf	40
SR1810 2rs	440C Stainless Steel	0.3125" (7.9375 mm)	0.5" (12.7000 mm)	0.1562" (3.9675 mm)	Sealed	94 lbf	45 lbf	36
R1810zz	52100 Chrome Steel	0.3125" (7.9375 mm)	0.5" (12.7000 mm)	0.1562" (3.9675 mm)	Shielded	104 lbf	50 lbf	40
SR1810zz	440C Stainless Steel	0.3125" (7.9375 mm)	0.5" (12.7000 mm)	0.1562" (3.9675 mm)	Shielded	94 lbf	45 lbf	36
R6	52100 Chrome Steel	0.375" (9.5250 mm)	0.875" (22.2250 mm)	0.2188" (5.5575 mm)	Open	638 lbf	256 lbf	32
SR6	440C Stainless Steel	0.375" (9.5250 mm)	0.875" (22.2250 mm)	0.2188" (5.5575 mm)	Open	574 lbf	230 lbf	28.8
R6 2rs	52100 Chrome Steel	0.375" (9.5250 mm)	0.875" (22.2250 mm)	0.2812" (7.1425 mm)	Sealed	638 lbf	256 lbf	32
SR6 2rs	440C Stainless Steel	0.375" (9.5250 mm)	0.875" (22.2250 mm)	0.2812" (7.1425 mm)	Sealed	574 lbf	230 lbf	28.8
R6zz	52100 Chrome Steel	0.375" (9.5250 mm)	0.875" (22.2250 mm)	0.2812" (7.1425 mm)	Shielded	638 lbf	256 lbf	32
SR6zz	440C Stainless Steel	0.375" (9.5250 mm)	0.875" (22.2250 mm)	0.2812" (7.1425 mm)	Shielded	574 lbf	230 lbf	28.8
SR3A 2rs	440C Stainless Steel	0.1875" (4.7625 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Open	300 lbf	118 lbf	34.2
R3A 2rs	52100 Chrome Steel	0.1875" (4.7625 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Open	333 lbf	131 lbf	38
SR3A	440C Stainless Steel	0.1875" (4.7625 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Open	255 lbf	101 lbf	34.2
R3A	52100 Chrome Steel	0.1875" (4.7625 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Open	283 lbf	112 lbf	38
SR3 2rs	440C Stainless Steel	0.1875" (4.7625 mm)	0.5" (12.7000 mm)	0.196" (4.9784 mm)	Sealed	224 lbf	79 lbf	38.7
R3 2rs	52100 Chrome Steel	0.1875" (4.7625 mm)	0.5" (12.7000 mm)	0.196" (4.9784 mm)	Sealed	249 lbf	88 lbf	43
SR3	440C Stainless Steel	0.1875" (4.7625 mm)	0.5" (12.7000 mm)	0.1562" (3.9675 mm)	Open	224 lbf	79 lbf	38.7
R3	52100 Chrome Steel	0.1875" (4.7625 mm)	0.5" (12.7000 mm)	0.1562" (3.9675 mm)	Open	249 lbf	88 lbf	43
SR166zz	440C Stainless Steel	0.1875" (4.7625 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Shielded	122 lbf	44 lbf	45
R166zz	52100 Chrome Steel	0.1875" (4.7625 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Shielded	136 lbf	49 lbf	50
SR166 2rs	440C Stainless Steel	0.1875" (4.7625 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Sealed	122 lbf	44 lbf	45
R166 2rs	52100 Chrome Steel	0.1875" (4.7625 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Sealed	136 lbf	49 lbf	50
SR166	440C Stainless Steel	0.1875" (4.7625 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Open	122 lbf	44 lbf	45
R166	52100 Chrome Steel	0.1875" (4.7625 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Open	136 lbf	49 lbf	50
SR156zz	440C Stainless Steel	0.1875" (4.7625 mm)	0.3125" (7.9375 mm)	0.125" (3.1750 mm)	Shielded	62 lbf	24 lbf	47.7
R156zz	52100 Chrome Steel	0.1875" (4.7625 mm)	0.3125" (7.9375 mm)	0.125" (3.1750 mm)	Shielded	69 lbf	27 lbf	53
SR156 2rs	440C Stainless Steel	0.1875" (4.7625 mm)	0.3125" (7.9375 mm)	0.125" (3.1750 mm)	Sealed	62 lbf	24 lbf	47.7
R156 2rs	52100 Chrome Steel	0.1875" (4.7625 mm)	0.3125" (7.9375 mm)	0.125" (3.1750 mm)	Sealed	69 lbf	27 lbf	53
SR156	440C Stainless Steel	0.1875" (4.7625 mm)	0.3125" (7.9375 mm)	0.1094" (2.7788 mm)	Open	62 lbf	24 lbf	47.7
R156	52100 Chrome Steel	0.1875" (4.7625 mm)	0.3125" (7.9375 mm)	0.1094" (2.7788 mm)	Open	69 lbf	27 lbf	53

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