30 models in the O series, 9.525–152.4 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) | |
|---|---|---|---|---|---|
| O-3 | NACHI | 9.525 | 25.4 | 13.494 | — |
| O-4 | NACHI | 12.7 | 32.544 | 15.875 | — |
| O-5 | NACHI | 15.875 | 35.719 | 15.875 | — |
| O-6 | NACHI | 19.05 | 38.894 | 15.875 | — |
| O-7 | NACHI | 22.225 | 42.069 | 15.875 | — |
| O-8 | NACHI | 25.4 | 45.244 | 15.875 | — |
| O-9 | NACHI | 28.575 | 48.419 | 15.875 | — |
| O-10 | NACHI | 31.75 | 53.181 | 18.256 | — |
| O-11 | NACHI | 34.925 | 56.356 | 18.256 | — |
| O-12 | NACHI | 38.1 | 59.531 | 18.256 | — |
| O-13 | NACHI | 41.275 | 62.706 | 18.256 | — |
| O-14 | NACHI | 44.45 | 68.262 | 19.05 | — |
| O-15 | NACHI | 47.625 | 71.438 | 19.05 | — |
| O-16 | NACHI | 50.8 | 75.406 | 19.05 | — |
| O-17 | NACHI | 53.975 | 81.756 | 22.225 | — |
| O-18 | NACHI | 57.15 | 84.931 | 22.225 | — |
| O-19 | NACHI | 60.325 | 91.281 | 25.4 | — |
| O-20 | NACHI | 63.5 | 94.456 | 25.4 | — |
| O-21 | NACHI | 66.675 | 97.631 | 25.4 | — |
| O-22 | NACHI | 69.85 | 102.394 | 25.4 | — |
| O-23 | NACHI | 73.025 | 105.569 | 25.4 | — |
| O-24 | NACHI | 76.2 | 111.125 | 28.575 | — |
| O-26 | NACHI | 82.55 | 122.238 | 31.75 | — |
| O-28 | NACHI | 88.9 | 128.588 | 31.75 | — |
| O-30 | NACHI | 95.25 | 134.938 | 31.75 | — |
| O-32 | NACHI | 101.6 | 147.638 | 34.925 | — |
| O-36 | NACHI | 114.3 | 166.688 | 44.45 | — |
| O-40 | NACHI | 127 | 185.738 | 50.8 | — |
| O-44 | NACHI | 139.7 | 204.788 | 55.562 | — |
| O-48 | NACHI | 152.4 | 220.662 | 60.325 | — |
O 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