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NAS1291-8
Locking Extended Washer Nut Self
Description
Self Locking Hex Nut
Specifications
| Alternate Part Number | MS21042L8 |
|---|---|
| Criticality Code Justification | Feat |
| Dimension A | 0.350 in |
| Dimension B | 0.556 in |
| Dimension H | 0.225 in |
| Dimension W | 0.814 in |
| Features | Lightweight |
| Industry Standards/Certification | NAS1291 |
| Locking Feature | Prevailing torque all metal design |
| Lubrication | Dry film lubricant |
| Material | Steel |
| Nut Style | Hexagon |
| Overall Height | Between 0.35 inches and 0.41 inches |
| Service Temperature | 450 ºF |
| Special Features | Weapon system essential |
| Specification Data | 80205-nas1291 professional/industrial association standard |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Qq-p-416 federal specification single treatment response |
| Temperature Rating | 450 degrees fahrenheit |
| Thread | 1/2-20 |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series | Unjf (fine thread with external controlled root radius) |
| Thread Size | 0.5000-20 |
| Type | Self-Locking Nut |
| Washer Outside Diameter | 0.814 |
| Washer Thickness | 0.04 |
| Weight | 0.015 lb |
| Width Across Flats | Between 0.556 inches and 0.566 inches |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
- NAS1291-7
- NAS1291-8
- NAS1291-9
- NAS1291-10
Cross-reference
No interchangeable or dimensionally similar parts are on record for NAS1291-8. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error