15 models in the 684 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) | |
|---|---|---|---|---|---|
| 684 | ANDGE | 4 | 9 | 2.5 | Cross-ref → |
| 684 | NACHI | 4 | 9 | 2.5 | Cross-ref → |
| 684 | NTN | 4 | 9 | 2.5 | Cross-ref → |
| 684 | NSK | 4 | 9 | 2.5 | Cross-ref → |
| 684-2RS/Z2 | ANDGE | 4 | 9 | 2.5 | — |
| 684-Z | ANDGE | 4 | 9 | 4 | — |
| 684-ZC3 | ANDGE | 4 | 9 | 4 | — |
| 684-ZZ | ANDGE | 4 | 9 | 4 | — |
| 684-ZZC3 | ANDGE | 4 | 9 | 4 | — |
| 684-ZZC3P6QE6 | ANDGE | 4 | 9 | 4 | — |
| 684A | NSK | 4 | 9 | 2.5 | — |
| 684AX50 | NTN | 4 | 9 | 2.5 | — |
| 684AZZ | NSK | 4 | 9 | 4 | — |
| 684C3 | ANDGE | 4 | 9 | 2.5 | — |
| 684ZZ | ANDGE | 4 | 9 | 4 | — |
684 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