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)(4)

0.25" (6.3500 mm)(24)

0.3125" (7.9375 mm)(2)
OD

0.375" (9.5250 mm)(6)

0.5" (12.7000 mm)(10)

0.625" (15.8750 mm)(8)

0.75" (19.0500 mm)(6)
Width

0.125" (3.1750 mm)(8)

0.1562" (3.9675 mm)(2)

0.1875" (4.7625 mm)(4)

0.196" (4.9784 mm)(10)

0.2188" (5.5575 mm)(2)

0.2812" (7.1425 mm)(4)
Static Load

104 lbf(1)

186 lbf(3)

207 lbf(3)

224 lbf(1)

249 lbf(1)

255 lbf(4)

283 lbf(4)

401 lbf(3)

446 lbf(3)

64 lbf(3)

71 lbf(3)

94 lbf(1)

Part Number	Ring Material	ID	OD	Width	Shield Type	Dynamic Load	Static Load	Limited Speed(x1K rpm)
R3Azz	52100 Chrome Steel	0.1875" (4.7625 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Shielded	283 lbf	112 lbf	38
SR3Azz	440C Stainless Steel	0.1875" (4.7625 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Shielded	255 lbf	101 lbf	34.2
R3zz	52100 Chrome Steel	0.1875" (4.7625 mm)	0.5" (12.7000 mm)	0.196" (4.9784 mm)	Shielded	249 lbf	88 lbf	43
SR3zz	440C Stainless Steel	0.1875" (4.7625 mm)	0.5" (12.7000 mm)	0.196" (4.9784 mm)	Shielded	224 lbf	79 lbf	38.7
R168	52100 Chrome Steel	0.25" (6.3500 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Open	71 lbf	31 lbf	48
SR168	440C Stainless Steel	0.25" (6.3500 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Open	64 lbf	28 lbf	43.2
R168 2rs	52100 Chrome Steel	0.25" (6.3500 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Sealed	71 lbf	31 lbf	48
SR168 2rs	440C Stainless Steel	0.25" (6.3500 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Sealed	64 lbf	28 lbf	43.2
R168zz	52100 Chrome Steel	0.25" (6.3500 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Shielded	71 lbf	31 lbf	48
SR168zz	440C Stainless Steel	0.25" (6.3500 mm)	0.375" (9.5250 mm)	0.125" (3.1750 mm)	Shielded	64 lbf	28 lbf	43.2
R188	52100 Chrome Steel	0.25" (6.3500 mm)	0.5" (12.7000 mm)	0.125" (3.1750 mm)	Open	207 lbf	80 lbf	40
SR188	440C Stainless Steel	0.25" (6.3500 mm)	0.5" (12.7000 mm)	0.125" (3.1750 mm)	Open	186 lbf	72 lbf	36
R188 2rs	52100 Chrome Steel	0.25" (6.3500 mm)	0.5" (12.7000 mm)	0.1875" (4.7625 mm)	Sealed	207 lbf	80 lbf	40
SR188 2rs	440C Stainless Steel	0.25" (6.3500 mm)	0.5" (12.7000 mm)	0.1875" (4.7625 mm)	Sealed	186 lbf	72 lbf	36
R188zz	52100 Chrome Steel	0.25" (6.3500 mm)	0.5" (12.7000 mm)	0.1875" (4.7625 mm)	Shielded	207 lbf	80 lbf	40
SR188zz	440C Stainless Steel	0.25" (6.3500 mm)	0.5" (12.7000 mm)	0.1875" (4.7625 mm)	Shielded	186 lbf	72 lbf	36
R4	52100 Chrome Steel	0.25" (6.3500 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Open	283 lbf	112 lbf	38
SR4	440C Stainless Steel	0.25" (6.3500 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Open	255 lbf	101 lbf	34.2
R4 2rs	52100 Chrome Steel	0.25" (6.3500 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Sealed	283 lbf	112 lbf	38
SR4 2rs	440C Stainless Steel	0.25" (6.3500 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Sealed	255 lbf	101 lbf	34.2
R4A	52100 Chrome Steel	0.25" (6.3500 mm)	0.75" (19.0500 mm)	0.2188" (5.5575 mm)	Open	446 lbf	161 lbf	36
SR4A	440C Stainless Steel	0.25" (6.3500 mm)	0.75" (19.0500 mm)	0.2188" (5.5575 mm)	Open	401 lbf	145 lbf	32.4
R4A 2rs	52100 Chrome Steel	0.25" (6.3500 mm)	0.75" (19.0500 mm)	0.2812" (7.1425 mm)	Sealed	446 lbf	161 lbf	36
SR4A 2rs	440C Stainless Steel	0.25" (6.3500 mm)	0.75" (19.0500 mm)	0.2812" (7.1425 mm)	Sealed	401 lbf	145 lbf	32.4
R4Azz	52100 Chrome Steel	0.25" (6.3500 mm)	0.75" (19.0500 mm)	0.2812" (7.1425 mm)	Shielded	446 lbf	161 lbf	36
SR4Azz	440C Stainless Steel	0.25" (6.3500 mm)	0.75" (19.0500 mm)	0.2812" (7.1425 mm)	Shielded	401 lbf	145 lbf	32.4
R4zz	52100 Chrome Steel	0.25" (6.3500 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Shielded	283 lbf	112 lbf	38
SR4zz	440C Stainless Steel	0.25" (6.3500 mm)	0.625" (15.8750 mm)	0.196" (4.9784 mm)	Shielded	255 lbf	101 lbf	34.2
R1810	52100 Chrome Steel	0.3125" (7.9375 mm)	0.5" (12.7000 mm)	0.1562" (3.9675 mm)	Open	104 lbf	50 lbf	40
SR1810	440C Stainless Steel	0.3125" (7.9375 mm)	0.5" (12.7000 mm)	0.1562" (3.9675 mm)	Open	94 lbf	45 lbf	36

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