nuts › plain slotted hexagon nuts
AN320-4
Aeronautical Standard Plain Slotted Hexagon Nut
Description
Castellated Nut
Specifications
| Bearing Surface Type | Chamfered or washer faced |
|---|---|
| Dimension A | 0.438 in |
| Dimension A Tolerance | +0.002 in |
| Dimension B | 0.500 in |
| Dimension H | 0.188 in |
| Industry Standards/Certification | AN320 |
| Material | Steel |
| Minimum Ultimate Tensile Strength (Steel) | 2040 lb |
| NIIN | 00-176-8108 |
| NSN | 5310-00-176-8108 |
| Nut Height | Between 0.178 inches and 0.198 inches |
| Nut Style | Hexagon slotted |
| Surface Treatment | Cadmium |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | Unf (fine thread) |
| Thread Size | 0.25, 1/4-28 |
| Thread T | 0.2500-28 |
| Type | Cad Plated, Shear Castellated |
| Weight | 0.0048 lb |
| Width Across Flats | Between 0.428 inches and 0.440 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.
- MS9364-10 MS 1/4-28 · Iron
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Catalog data updated 2026-07-05. Report a data error