Extra-light inch Series Ball Bearings, R-Series Ball Bearings from National Precision



R4 Open	R4 Z 1 Shield	R4 ZZ 2 Shields	R4 RS 1 Contact Seal	R4 2RS 2 Contact Seals	R4 NR Retain. Ring, Groove on OD

R SERIES BALL BEARINGS \| EXTRA LIGHT INCH
NPB Part No. RFQ per item	Bore			Outside Diameter			Width		Max. Fillet Radius	Balls		Static Load Lbs.	Dynamic Load Lbs.
	Frac.	Inch	Tol.	Frac.	Inch	Tol.	Tol.	+.0000 -.0050		No.	Diam.
	Frac.	Inch	Tol.	Frac.	Inch	Tol.	Open	Seal/Shield		No.	Diam.
R2	1/8	.1250	-.0003	3/8	.3750	-.0004	.1562	.1562	.012	7	1/16	49	113
R3	3/16	.1875	-.0003	1/2	.5000	-.0004	.1562	.1960	.012	7	3/32	70	145
R4	1/4	.2500	-.0003	5/8	.6250	-.0004	.1960	.1960	.012	7	1/8	195	385
R4A	1/4	.2500	-.0003	3/4	.7500	-.0004	.2188	.2812	.016	6	9/54	150	320
R6	3/8	.3750	-.0003	7/8	.8750	-.0004	.2188	.2812	.016	7	5/32	305	570
R8	1/2	.5000	-.0003	1 1/8	1.1250	-.0004	.2500	.3125	.016	8	3/16	500	885
R10	5/8	.6250	-.0003	1 3/8	1.3750	-.0005	.2812	.3438	.031	9	3/16	565	970
R12	3/4	.7500	-.0004	1 5/8	1.6250	-.0005	.3125	.4375	.031	10	7/32	850	1265
R14	7/8	.8750	-.0004	1 7/8	1.8750	-.0005	.3750	.5000	.031	10	1/4	1110	1735
R16	1	1.0000	-.0004	2	2.0000	-.0005	.3750	.5000	.031	10	1/4	1110	1735
R18	1 1/8	1.1250	-.0004	2 1/8	2.1250	-.0005	.3750	.5000	.031	11	1/4	1225	1840
R20	1 1/4	1.2500	-.0005	2 1/4	2.2500	-.0005	.3750	.5000	.031	12	1/4	1335	1920

Material: Standard SAE 52100

Stainless Steel available upon request

The R-Series bearings are single row, inch series bearings available from 1/8 through 1-1/2 inch bore sizes. The Conrad construction of these bearings enables them to accept thrust as well as radial load. Their ball complement and selection of retainers also allows them to work well in high-speed applications. R series bearings are available in open, sealed and shielded configurations. Sealed and shielded bearings may be slightly wider as shown in the table. This series is also available in stainless steel.

NATIONAL PRECISION BEARING GROUP
of Mechatronics, Inc.

Phone: 800-426-8038 • 425-222-5900 • Fax: 425-222-5950
E-mail: sales@nationalprecision.com

Purchase Order Terms and Conditions