Rockwell 3.75" Oil Cap Assembly (PAIR) – Fits 9K–16K Drums
Part Number: RW12011-2
These replacement oil cap assemblies are designed for Rockwell hubs and drums rated between 9,000 lb and 16,000 lb. Each cap uses a 3.75" OD thread with 8 TPI and replaces Rockwell part number 12011-1. Common on Rockwell American brake drums built after 1996 and compatible with select Kodiak disc brake hubs using this thread size.
Features
- Direct replacement for Rockwell 12011-1 oil caps
- Typically used on 9K–16K Rockwell axle systems
- 3.75" OD threaded cap — 8 TPI
- Includes cap, sight window, plug, and O-ring
- Also fits certain Kodiak disc brake hubs with matching threads
Specifications
| Specification | Detail |
| Thread Diameter | 3.75" |
| Thread Pitch | 8 threads per inch |
| Axle Rating | Common on 9K–16K Rockwell axles |
| Replaces | Rockwell 12011-1 |
Fitment varies by axle and hub manufacturer. Always compare thread size, diameter, and O-ring seat dimensions before installation.