36 models in the 231 series, 110–460 mm bore. Every row links to the full specification page and to the cross-reference page of that model.
| Model | Brand | Bore d (mm) | OD D (mm) | Width B (mm) | |
|---|---|---|---|---|---|
| 23122RH | KOYO | 110 | 180 | 56 | — |
| 23124AX | NACHI | 120 | 200 | 62 | — |
| 23124EX1 | NACHI | 120 | 200 | 62 | — |
| 23124RH | KOYO | 120 | 200 | 62 | — |
| 23126AX | NACHI | 130 | 210 | 64 | — |
| 23126EX1 | NACHI | 130 | 210 | 64 | — |
| 23126RH | KOYO | 130 | 210 | 64 | — |
| 23128RH | KOYO | 140 | 225 | 68 | — |
| 23130RH | KOYO | 150 | 250 | 80 | — |
| 23134AX | NACHI | 170 | 280 | 88 | — |
| 23134EX1 | NACHI | 170 | 280 | 88 | — |
| 23136A2X | NACHI | 180 | 300 | 96 | — |
| 23136E | NACHI | 180 | 300 | 96 | — |
| 23138R | KOYO | 190 | 320 | 104 | — |
| 23138RHA | KOYO | 190 | 320 | 104 | — |
| 23140A2X | NACHI | 200 | 340 | 112 | — |
| 23140E | NACHI | 200 | 340 | 112 | — |
| 23140RHA | KOYO | 200 | 340 | 112 | — |
| 23140RR | KOYO | 200 | 340 | 112 | — |
| 23144R | KOYO | 220 | 370 | 120 | — |
| 23144RHA | KOYO | 220 | 370 | 120 | — |
| 23148A2X | NACHI | 240 | 400 | 128 | — |
| 23152E | NACHI | 260 | 440 | 144 | — |
| 23152RHA | KOYO | 260 | 440 | 144 | — |
| 23152RR | KOYO | 260 | 440 | 144 | — |
| 23156E | NACHI | 280 | 460 | 146 | — |
| 23156RHA | KOYO | 280 | 460 | 146 | — |
| 23156RR | KOYO | 280 | 460 | 146 | — |
| 23172E | NACHI | 360 | 600 | 192 | — |
| 23172R | KOYO | 360 | 600 | 192 | — |
| 23172RHA | KOYO | 360 | 600 | 192 | — |
| 23176R | KOYO | 380 | 620 | 194 | — |
| 23176RHA | KOYO | 380 | 620 | 194 | — |
| 23192E | NACHI | 460 | 760 | 240 | — |
| 23192R | KOYO | 460 | 760 | 240 | — |
| 23192RHA | KOYO | 460 | 760 | 240 | — |
231 series bearings follow the ISO dimension plan for this family, so a given number is dimensionally interchangeable between brands - see the cross-reference to confirm. Choose the suffix for your duty: shields for dry, clean positions, contact seals for wet or dusty ones, and a larger clearance class where the fit or temperature demands it.
Other Cylindrical Roller Bearings series: NU · NJ · N · NUP · NN · FC · NNU · LSE