Rockwell 3.75" Oil Cap Assembly – Fits 9K–16K Drums (RW12011-1)
Part Number: RW12011-1
This is a single Rockwell-style 3.75" oil cap assembly used on many 9,000–16,000 lb Rockwell American hubs and drums manufactured after 1996. It replaces Rockwell part number 12011-1 and is also used on some Kodiak disc brake hubs that accept a 3.75" oil cap.
Features
- Single replacement oil cap assembly for Rockwell hubs
- Fits many 9K–16K Rockwell American axle drum applications
- 3.75" OD with 8 TPI thread
- Includes clear sight lens, plug, and O-ring
- Common on Rockwell American hubs built after 1996
Specifications
| Specification | Detail |
|---|---|
| Thread Diameter | 3.75" |
| Thread Pitch | 8 TPI |
| Axle Range | Typically used on 9K–16K Rockwell axles |
| Replaces | Rockwell 12011-1 |
| Included Components | Cap, sight lens, center plug, O-ring |
Fitment varies by axle and hub manufacturer. Always compare thread diameter, pitch, and O-ring seat dimensions with your existing cap before installation.