6309 Bearing Dimensions
45 × 100 × 25 mm
✓ Verified starter recordThe standard 6309 bearing has a 45 mm bore, 100 mm outside diameter, and 25 mm width. This page provides a dimensional reference in millimeters and inches, plus nearby sizes for comparison.
6309 bearing size
| Dimension | Metric | Inches |
|---|---|---|
| Bore diameter (d) | 45 mm | 1.7717 in |
| Outside diameter (D) | 100 mm | 3.9370 in |
| Width (B) | 25 mm | 0.9843 in |
Inch values are metric conversions rounded to four decimal places.
What does 6309 mean?
6309 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 6309 should therefore be checked against 45 × 100 × 25 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
6309 dimension FAQ
What is the bore of a 6309?
The bore diameter is 45 mm (1.7717 in).
What is the OD of a 6309?
The outside diameter is 100 mm (3.9370 in).
How wide is a 6309?
The bearing width is 25 mm (0.9843 in).