Military Standard - Self-Locking Extended Washer Nut - MS21045L4
Standard Part
Description: Self-Locking Extended Washer Nut
Part Number: MS21045L4
Alternate Part Numbers: H55-4, RM1801-048, YE3200, NAS1022AM4, SL2374-4, 28FH-428, SPS28GH428
Product Overview
A nut having a flat bottom and 6 sides. An integral feature is incorporated for locking on the threads of a mating member. Excludes nut (1), self-locking, cap.
Item Specification
| Thread Class | 3B | |
| Thread Direction | Right-hand | |
| Locking Feature | Prevailing torque all-metal design | |
| Lubrication | Dry film lubricant | |
| Nut Style | Hexagon | |
| Nut Height | 0.240 inches minimum and 0.328 inches maximum | |
| End Item Identification | High-mobility artillery rocket system (himars) | |
| Width Across Flats | 0.430 inches minimum and 0.439 inches maximum | |
| Temp Rating | 450.0 deg fahrenheit nominal | |
| Thread Series | UNJF | |
| Thread Quantity per Inch | 28 | |
| Nominal Thread Size | 0.250 inches | |
| Countersink Angle | 88.0 degrees nominal nut | |
| Bearing Surface Type | Chamfered | |
| Bearing Surface Finish | 125.0 microinches | |
| Material | Steel overall | |
| Surface Treatment | Cadmium overall | |
| Surface Treatment Document and Classification | QQ-P-416 fed spec single treatment response overall |