Ball Bearings
R Series Extra Light Inch Ball Bearings
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
Extra Light Inch Ball Bearings

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.
Open Seal/Shield
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.