25 models in the 121 series, 30.96–4272 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) | |
|---|---|---|---|---|---|
| 121BULK | TIMKEN | — | |||
| 121PKG | TIMKEN | — | |||
| 12131 | SKF | 30.96 | — | ||
| 12168/303 | KOYO | 42.862 | 76.992 | 17.145 | — |
| 12175/303 | KOYO | 44.45 | 76.992 | 17.145 | — |
| 121.25.500 | ANDGE | 398 | 602 | 75 | — |
| 121.25.560 | ANDGE | 458 | 662 | 75 | — |
| 121.25.630 | ANDGE | 528 | 732 | 75 | — |
| 121.25.710 | ANDGE | 608 | 812 | 75 | — |
| 121.28.800 | ANDGE | 678 | 922 | 82 | — |
| 121.28.900 | ANDGE | 778 | 1022 | 82 | — |
| 121.28.1000 | ANDGE | 878 | 1122 | 82 | — |
| 121.28.1120 | ANDGE | 998 | 1242 | 82 | — |
| 121.32.1250 | ANDGE | 1110 | 1390 | 91 | — |
| 121.32.1400 | ANDGE | 1260 | 1540 | 91 | — |
| 121.32.1600 | ANDGE | 1460 | 1740 | 91 | — |
| 121.32.1800 | ANDGE | 1660 | 1940 | 91 | — |
| 121.40.2000 | ANDGE | 1825 | 2178 | 112 | — |
| 121.40.2240 | ANDGE | 2065 | 2418 | 112 | — |
| 121.40.2500 | ANDGE | 2325 | 2678 | 112 | — |
| 121.40.2800 | ANDGE | 2625 | 2978 | 112 | — |
| 121.50.3150 | ANDGE | 2922 | 3376 | 134 | — |
| 121.50.3550 | ANDGE | 3322 | 3776 | 134 | — |
| 121.50.4000 | ANDGE | 3772 | 4226 | 134 | — |
| 121.50.4500 | ANDGE | 4272 | 4726 | 134 | — |
121 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 Custom & Special Bearings series: 62 · 685 · 63 · 60 · SNV · K · BND · 697