51204 (Thrust Ball bearing)
The 51204 is a Thrust Ball bearing with boundary dimensions of 20 x 40 x 14 mm (bore x outside diameter x width). It has a basic dynamic load rating of 22.4 kN and a basic static load rating of 38 kN.
Cross-Reference
| Manufacturer | Reference |
|---|---|
| SKF | 51204 |
| Timken | 51204 |
| FAG (Schaeffler) | 51204 |
Cross-references are matched on the ISO 15 boundary dimensions
(20 x 40 x 14 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) | 40 mm |
| Width (B/T) | 14 mm |
Load Ratings
| Rating | Value |
|---|---|
| Basic dynamic load rating (C) | 22.4 kN |
| Basic static load rating (C0) | 38 kN |
Type & Application Notes
Thrust Ball bearings are carries axial loads only and must not be subjected to radial load. The 51204 is commonly found in vertical shafts, crane hooks, and low-speed axial-load applications. Dynamic rating 22.4 kN sets the load a bearing can carry for a one-million-revolution rating life (L10), while the static rating 38 kN governs the maximum load a stationary bearing can withstand without permanent deformation.
Interchange Notes
When substituting the 51204:
- Match the boundary dimensions (20 x 40 x 14 mm) exactly — this is what guarantees fit.
- Match the bearing type (Thrust Ball); mixing roller and ball types changes stiffness, speed limits, and load capacity.
- Match or exceed the dynamic load rating (22.4 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 51204?
The Timken equivalent is 51204.
What FAG bearing crosses to SKF 51204?
The FAG (Schaeffler) equivalent is 51204.
What are the dimensions of the 51204 bearing?
20 x 40 x 14 mm (bore x OD x width).
What is the load rating of the 51204 bearing?
Dynamic 22.4 kN, static 38 kN.
What type of bearing is the 51204?
It is a Thrust Ball bearing.