nuts › plain castellated hexagon nuts
AN310D4
Aeronautical Standard Nut
Description
Thread Size: 1/4", Nut Height: 1/4", Head Width: 3/8"
Specifications
| Bearing Surface Type | Washer faced |
|---|---|
| Countersink Angle | 110.0 degrees nominal nut |
| Material | Aluminum |
| Nondefinitive Specification/Std Data | 5 type |
| Nut Height | 0.281 |
| Nut Style | Castellated, hexagon |
| Surface Treatment | Anodize |
| Surface Treatment Specification | Mil-a-8625,ty 2 mil spec single treatment response |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNF |
| Thread Size | 0.250 |
| Width Across Flats | 0.428 inches minimum and 0.440 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 AN310D4. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error