nuts › plain castellated hexagon nuts
AN310-20
Aeronautical Standard Plain Castellated Hexagon Nut
Description
Thread Size: 1-1/4", Nut Height: 1-1/4", Head Width: 1-7/8", AN310 series nut
Specifications
| Bearing Surface Type | Washer faced |
|---|---|
| Countersink Angle | 109.0 degrees minimum nut and 111.0 degrees maximum nut |
| Hardness Rating | 80.0 rockwell b minimum and 32.0 rockwell c maximum |
| Material | Steel |
| Nondefinitive Specification/Std Data | 5 type and a grade |
| Nut Height | 1.234 inches minimum and 1.266 inches maximum |
| Nut Style | Castellated, hexagon |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Qq-p-416,ty 2,cl 2 fed spec single treatment response |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 12 |
| Thread Qty Per Inch (tpi) | 12 |
| Thread Series | UNF |
| Thread Size | 1.250 |
| Width Across Flats | 1.852 inches minimum and 1.877 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 AN310-20. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error