nuts › plain slotted hexagon nuts
AN320C4
Aeronautical Standard Plain Slotted Hexagon Nut
Description
Castellated Nut
Specifications
| Bearing Surface Finish | 125.0 microinches |
|---|---|
| Bearing Surface Type | Chamfered or washer faced |
| Material | Steel |
| NIIN | 00-721-4434 |
| NSN | 5310-00-721-4434 |
| Nut Height | 0.172 inches minimum and 0.203 inches maximum |
| Nut Style | Slotted, hexagon |
| Surface Treatment | Passivate |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNF |
| Thread Size | 0.250, 1/4-28 |
| Type | Stainless Steel |
| Weight | .005 lb |
| 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 AN320C4. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error