Dexter FORTRESS Aluminum Oil Bath Hub Cap — 3.75" Diameter
Part Number: K21-304-00
Genuine Dexter FORTRESS series aluminum oil bath hub cap designed for use on heavy-duty oil-lubricated trailer hubs. This cap features a 3.75" diameter and is intended for select 10,000 lb through 16,000 lb axle applications. Engineered by Dexter for compatibility with specific hub and spindle systems.
Features
- Genuine Dexter FORTRESS series oil bath hub cap
- Machined aluminum construction
- Designed for oil-lubricated trailer hubs
- 3.75" diameter cap size
- Direct replacement style component for select heavy-duty axles
Specifications
| Specification | Detail |
|---|---|
| Manufacturer | Dexter |
| Series | FORTRESS |
| Part Number | K21-304-00 |
| Hub Type | Oil bath |
| Cap Diameter | 3.75" |
| Axle Rating Range | Typically used on 10K–16K axle systems |
| Material | Aluminum |
This cap replaces several legacy oil cap designs used across multiple axle platforms. Verify hub bore size, spindle nut clearance, and manufacturer specifications before installation.