10 models in the 638 series, 2–8 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) | |
|---|---|---|---|---|---|
| 638/2X2/P5 | ANDGE | 2 | 5 | 2.5 | — |
| 638/2X2/P6 | ANDGE | 2 | 5 | 2.5 | — |
| 638/2.5X2/P5 | ANDGE | 2.5 | 6 | 2.5 | — |
| 638/2.5X2/P6 | ANDGE | 2.5 | 6 | 2.5 | — |
| 638 | KOYO | 8 | 28 | 9 | Cross-ref → |
| 638-2Z/P5 | ANDGE | 8 | 28 | 9 | — |
| 638-2Z/P6 | ANDGE | 8 | 28 | 9 | — |
| 638-Z/P5 | ANDGE | 8 | 28 | 9 | — |
| 638-Z/P6 | ANDGE | 8 | 28 | 9 | — |
| 638ZZ | KOYO | 8 | 28 | 9 | Cross-ref → |
638 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