11 models in the 691 series, 1–1.5 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) | |
|---|---|---|---|---|---|
| 691 | ANDGE | 1 | 4 | 1.6 | Cross-ref → |
| 691 | NSK | 1 | 4 | 1.6 | Cross-ref → |
| 691 | NTN | 1 | 4 | 1.6 | Cross-ref → |
| 691-Z | ANDGE | 1 | 4 | 2.3 | — |
| 691-ZC3 | ANDGE | 1 | 4 | 2.3 | — |
| 691-ZZ | ANDGE | 1 | 4 | 2.3 | — |
| 691-ZZC3 | ANDGE | 1 | 4 | 2.3 | — |
| 691-ZZC3P6QE6 | ANDGE | 1 | 4 | 2.3 | — |
| 691C3 | ANDGE | 1 | 4 | 1.6 | — |
| 691X | NSK | 1.5 | 5 | 2 | — |
| 691XZZ | NSK | 1.5 | 5 | 2.6 | — |
691 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 Deep Groove Ball Bearings series: 62 · 60 · 63 · 618 · 619 · 69 · 68 · 160