6308 Bearing Dimensions
40 × 90 × 23 mm
✓ Verified starter recordThe standard 6308 bearing has a 40 mm bore, 90 mm outside diameter, and 23 mm width. This page provides a dimensional reference in millimeters and inches, plus nearby sizes for comparison.
6308 bearing size
| Dimension | Metric | Inches |
|---|---|---|
| Bore diameter (d) | 40 mm | 1.5748 in |
| Outside diameter (D) | 90 mm | 3.5433 in |
| Width (B) | 23 mm | 0.9055 in |
Inch values are metric conversions rounded to four decimal places.
What does 6308 mean?
6308 identifies a bearing in the 6300 dimensional series. For practical replacement work, the key fit dimensions are the bore, outside diameter and width. A part marked 6308 should therefore be checked against 40 × 90 × 23 mm before selection.
Suffixes such as seals, shields, internal clearance or manufacturer-specific variants can change construction or operating characteristics even when the principal dimensions remain the same. Confirm the exact manufacturer designation for critical applications.
Related bearing dimensions
6308 dimension FAQ
What is the bore of a 6308?
The bore diameter is 40 mm (1.5748 in).
What is the OD of a 6308?
The outside diameter is 90 mm (3.5433 in).
How wide is a 6308?
The bearing width is 23 mm (0.9055 in).