- 1/4"-28 UNJF self‑locking castellated hex nut with nylon insert for prevailing‑torque retention
- Carbon steel, cadmium plated per QQ‑P‑416 Type II Class 3 for corrosion resistance
- Provides both mechanical cotter‑pin locking through slots and nylon insert locking up to 250 deg F service temperature
| Type | Nut |
| Style | Self‑Locking Slotted |
| Size | 1/4"-28 x 7/16" |
| Material | Carbon Steel |
| Max Temp. | 250 deg F |
| Thread Style | UNJF, 1/4‑28, right‑hand |
| Head Style | Self‑locking castellated hexagon |
| Height | 0.32" |
| Locking Element | Secured with Cotter Pin |
| Mil-Spec | MS17825-4 |
