| JMB Part No. | R SERIES BALL BEARINGS ( INCH) | ||||||||
| Bore | Outside Diameter | Width | Balls | Static Load | Dynamic Load | ||||
| Inch (frac.) | Inch | Inch (frac.) | Inch | (Open) | No. | Diam. | Lbs. | Lbs. | |
| R2 (Open, Z, ZZ, RS, 2RS, …) | 1/8 | 0.125 | 3/8 | 0.375 | 0.1562 | 7 | 1/16 | 49 | 113 |
| R3 … | 3/16 | 0.1875 | 1/2 | 0.5 | 0.1562 | 7 | 3/32 | 70 | 145 |
| R4 … | 1/4 | 0.25 | 5/8 | 0.625 | 0.196 | 7 | 1/8 | 195 | 385 |
| R4A ... | 1/4 | 0.25 | 3/4 | 0.75 | 0.2188 | 6 | 1/6 | 150 | 320 |
| R6 … | 3/8 | 0.375 | 7/8 | 0.875 | 0.2188 | 7 | 5/32 | 305 | 570 |
| R8 … | 1/2 | 0.5 | 1 1/8 | 1.125 | 0.25 | 8 | 3/16 | 500 | 885 |
| R10 … | 5/8 | 0.625 | 1 3/8 | 1.375 | 0.2812 | 9 | 3/16 | 565 | 970 |
| R12 … | 3/4 | 0.75 | 1 5/8 | 1.625 | 0.3125 | 10 | 7/32 | 850 | 1265 |
| R14 … | 7/8 | 0.875 | 1 7/8 | 1.875 | 0.375 | 10 | 1/4 | 1110 | 1735 |
| R16 … | 1 | 1 | 2 | 2 | 0.375 | 10 | 1/4 | 1110 | 1735 |
| R18 … | 1 1/8 | 1.125 | 2 1/8 | 2.125 | 0.375 | 11 | 1/4 | 1225 | 1840 |
| R20 … | 1 1/4 | 1.25 | 2 1/4 | 2.25 | 0.375 | 12 | 1/4 | 1335 | 1920 |