15 models in the 634 series, 4–4 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) | |
|---|---|---|---|---|---|
| 634 | KOYO | 4 | 16 | 5 | Cross-ref → |
| 634-2RZ/P5 | ANDGE | 4 | 16 | 5 | — |
| 634-2RZ/P6 | ANDGE | 4 | 16 | 5 | — |
| 634-2Z/P5 | ANDGE | 4 | 16 | 5 | — |
| 634-2Z/P6 | ANDGE | 4 | 16 | 5 | — |
| 634-RZ/P5 | ANDGE | 4 | 16 | 5 | — |
| 634-RZ/P6 | ANDGE | 4 | 16 | 5 | — |
| 634-Z/P5 | ANDGE | 4 | 16 | 5 | — |
| 634-Z/P6 | ANDGE | 4 | 16 | 5 | — |
| 634/P4 | ANDGE | 4 | 16 | 5 | — |
| 634S | ANDGE | 4 | 16 | 5 | — |
| 634S/YA1 | ANDGE | 4 | 16 | 5 | — |
| 634Z | NTN | 4 | 16 | 5 | Cross-ref → |
| 634ZZ | NTN | 4 | 16 | 5 | Cross-ref → |
| 634ZZ | KOYO | 4 | 16 | 5 | Cross-ref → |
634 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