608 bearing size and miniature bearings 623 to 629
Small single row deep groove ball bearings, the 608 and the 623 to 629 sizes, with boundary dimensions to ISO 15. Pick a bearing to get its dimensions and CAD files.
Miniature bearing size chart
| Bearing | dmm | Dmm | Bmm | rmin, mm | Clowest of makers, kN | Chighest of makers, kN | C0lowest of makers, kN | C0highest of makers, kN |
|---|---|---|---|---|---|---|---|---|
| 608 | 8 | 22 | 7 | 0.3 | 3.3 | 3.7 | 1.37 | 1.4 |
| 623 | 3 | 10 | 4 | 0.15 | 0.54 | 0.71 | 0.18 | 0.224 |
| 624 | 4 | 13 | 5 | 0.2 | 0.936 | 1.45 | 0.29 | 0.49 |
| 625 | 5 | 16 | 5 | 0.3 | 1.14 | 1.94 | 0.38 | 0.68 |
| 626 | 6 | 19 | 6 | 0.3 | 2.3 | 2.59 | 0.885 | 0.95 |
| 627 | 7 | 22 | 7 | 0.3 | 3.3 | 3.7 | 1.37 | 1.4 |
| 629 | 9 | 26 | 8 | 0.3 | 4.6 | 5.05 | 1.96 | 2 |
Dimensions in millimetres unless stated. Select a row to load its CAD files above.
Bearing dimensions to ISO 15 and load ratings
Bore d, outside diameter D, width B and the minimum chamfer r are boundary dimensions set by ISO 15, so they are the same whichever maker you buy from. Load ratings are not: each maker publishes its own. The table gives the lowest and highest basic dynamic (C) and static (C0) ratings among the catalogues we checked; use your supplier's figure for the calculation.
The CAD file is a simplified shielded bearing: both rings with their chamfers and the space between them closed by flat shields. It is meant for assemblies and drawings, not for showing the balls and cage.
608 and 625 bearing size
In this group the last digit is the bore: a 623 has a 3 mm bore, a 625 a 5 mm bore, 16 mm outside and 5 mm wide. The 608, the bearing of skateboard and inline skate wheels, is 8 × 22 × 7 mm and has the same outside diameter and width as the 627.
Miniature bearings: common questions
- What size is a 608 bearing?
- 8 mm bore, 22 mm outside diameter and 7 mm wide.
- What size is a 625 bearing?
- 5 mm bore, 16 mm outside diameter and 5 mm wide.