nuts › plain castellated hexagon nuts
AN310C5
Aeronautical Standard Plain Castellated Hexagon Nut
Description
Castellated Nut
Specifications
| Countersink Angle | 110 degrees |
|---|---|
| Material | Steel |
| Material Specification | 66 federal standard all material responses |
| NIIN | 00-167-1281 |
| NSN | 5310-00-167-1281 |
| Nondefinitive Specification/Std Data | 5 type |
| Nut Height | Between 0.312 inches and 0.344 inches |
| Nut Style | Hexagon castellated |
| Surface Treatment | Passivate |
| Surface Treatment Specification | Qq-p-35 federal specification single treatment response |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series | Unf (fine thread) |
| Thread Size | 0.312, 5/16-24 |
| Type | Stainless Steel |
| Weight | 0.01 lb |
| Width Across Flats | Between 0.49 inches and 0.502 inches |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- AN310-5 AN 5/16-24 · Steel
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Catalog data updated 2026-07-05. Report a data error