6304 Bearing Dimensions
20 × 52 × 15 mm
✓ Verified starter recordThe standard 6304 bearing has a 20 mm bore, 52 mm outside diameter, and 15 mm width. This page provides a dimensional reference in millimeters and inches, plus nearby sizes for comparison.
6304 bearing size
| Dimension | Metric | Inches |
|---|---|---|
| Bore diameter (d) | 20 mm | 0.7874 in |
| Outside diameter (D) | 52 mm | 2.0472 in |
| Width (B) | 15 mm | 0.5906 in |
Inch values are metric conversions rounded to four decimal places.
What does 6304 mean?
6304 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 6304 should therefore be checked against 20 × 52 × 15 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
6304 dimension FAQ
What is the bore of a 6304?
The bore diameter is 20 mm (0.7874 in).
What is the OD of a 6304?
The outside diameter is 52 mm (2.0472 in).
How wide is a 6304?
The bearing width is 15 mm (0.5906 in).