- Self-locking nuts have a reduced height and are used in limited space applications where access is a problem
- These nuts are rated at a max temperature of 450° F and have a tensile strength of 160,000 psi
| Type | Nut |
| Style | Self-Locking |
| Size | #4-40 |
| Material | Aluminum |
| Max Temp. | 250° F |
| Thread Style | Coarse, UNJC-3B |
| Head Style | Hex |
| Height | 0.157 |
| Color | Blue |
| Locking Element | Nylon |
| Mil-Spec | MS21044D04 |
| NAS Spec | NASM21044 |
