6304 (Deep Groove Ball bearing)
The 6304 is a Deep Groove Ball bearing with boundary dimensions of 20 x 52 x 15 mm (bore x outside diameter x width). It has a basic dynamic load rating of 16.8 kN and a basic static load rating of 7.8 kN.
Cross-Reference
| Manufacturer | Reference |
|---|---|
| SKF | 6304 |
| Timken | 6304 |
| FAG (Schaeffler) | 6304 |
Cross-references are matched on the ISO 15 boundary dimensions
(20 x 52 x 15 mm) and bearing type, which is what makes parts interchangeable. The
suffixes (e.g. -2RS, -2Z, -E1) encode seals, shields, and internal design
variants, not the envelope size.
Boundary Dimensions
| Dimension | Value |
|---|---|
| Bore (d) | 20 mm |
| Outside diameter (D) | 52 mm |
| Width (B/T) | 15 mm |
Load Ratings
| Rating | Value |
|---|---|
| Basic dynamic load rating (C) | 16.8 kN |
| Basic static load rating (C0) | 7.8 kN |
Type & Application Notes
Deep Groove Ball bearings are the most widely used bearing type, carrying radial and moderate axial loads at high speed. The 6304 is commonly found in electric motors, pumps, gearboxes, and general rotating machinery. Dynamic rating 16.8 kN sets the load a bearing can carry for a one-million-revolution rating life (L10), while the static rating 7.8 kN governs the maximum load a stationary bearing can withstand without permanent deformation.
Interchange Notes
When substituting the 6304:
- Match the boundary dimensions (20 x 52 x 15 mm) exactly — this is what guarantees fit.
- Match the bearing type (Deep Groove Ball); mixing roller and ball types changes stiffness, speed limits, and load capacity.
- Match or exceed the dynamic load rating (16.8 kN) for the intended life.
- Respect the seal/shield suffix the application requires (open, Z, 2Z, RS, or 2RS).
Frequently Asked Questions
What Timken bearing crosses to SKF 6304?
The Timken equivalent is 6304.
What FAG bearing crosses to SKF 6304?
The FAG (Schaeffler) equivalent is 6304.
What are the dimensions of the 6304 bearing?
20 x 52 x 15 mm (bore x OD x width).
What is the load rating of the 6304 bearing?
Dynamic 16.8 kN, static 7.8 kN.
What type of bearing is the 6304?
It is a Deep Groove Ball bearing.