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AN121503
Aeronautical Standard Plain Hexagon Nut
Description
Engine Nut
Specifications
| Bearing Surface Finish | 63.0 microinches |
|---|---|
| Bearing Surface Type | Washer faced |
| Countersink Angle | 85.0 degrees minimum nut and 95.0 degrees maximum nut |
| Dimension H | 0.266 in |
| Hardness Rating | 19.0 rockwell c minimum and 26.0 rockwell c maximum |
| Industry Standards/Certification | AN121503 |
| Material | Steel |
| Material Specification | Ams 6322 assn std single material response |
| Maximum Dimension A | 0.492 in |
| Minimum Dimension A | 0.502 in |
| Minimum Dimension B | 0.561 in |
| NIIN | 00-268-6042 |
| NSN | 5310-00-268-6042 |
| Nut Height | 0.256 inches minimum and 0.276 inches maximum |
| Nut Style | Hexagon |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Ams 2400 assn std single treatment response |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series | UNF |
| Thread Size | 0.3125-24 |
| Type | Plain |
| Weight | 0.011 lb |
| Width Across Flats | 0.492 inches minimum and 0.502 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
No interchangeable or dimensionally similar parts are on record for AN121503. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error