Castle type nuts manufactured to MIL Specification MS21025 using 4140 steel. Mild steel nuts are not acceptable for use on certified aircraft. Use 1-1/4” nuts for 500x5 axles and 1-1/2” for 600x6.| Style | Thread Size | Part Number |
|---|---|---|
| Castle | 1-1/4x16 | 06-11800 |
| 1-1/2x16 | 06-11900 | |
| Round | 1-1/4x12 | 11725 |
| 1-1/2x16 | 11726 |
| Part Number | Description | Stock | Price | |
|---|---|---|---|---|
| 11726 | ROUND AXLE NUT 1-1/2" | 5 | £6.59 | |
| 11725 | NUT, AXLE ROUND 1-1/4 X 12 | 6 | £6.59 | |
| 06-11900 | CASTLE AXLE NUT 600 X 6 | 4 | £10.12 | |
| 06-11800 | NUT, AXLE CASTLE 1-1/4 X 16 | 4 | £8.11 |