The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-531-1591, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-531-1591 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Width Across Flats | 0.928 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | STM A967 ASSN STD SINGLE TREATMENT RESPONSE NUT |
| Thread Series | UNJC |
| Material Document and Classification | STM A479 ASSN STD SINGLE MATERIAL RESPONSE OR STM A493 ASSN STD SINGLE MATERIAL RESPONSE OR MS 5648 ASSN STD SINGLE MATERIAL RESPONSE NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.6250 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Surface Treatment | PASSIVATE NUT |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 11 |
| Material | STEEL COMP 316 NUT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MS17830-10C316 | 3/2 Design control — primary reference U.S. Government activity |
| MS17830 | 4/1 Identification reference U.S. Government activity |
| 167-8204845 PC 37 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 5310-01-531-1591 is a Nut,self-Locking,hexagon, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-592-0686, 5310-01-734-9981. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-531-1591: Width Across Flats: 0.928 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN; Surface Treatment Document and Classification: STM A967 ASSN STD SINGLE TREATMENT RESPONSE NUT; Thread Series: UNJC; Material Document and Classification: STM A479 ASSN STD SINGLE MATERIAL RESPONSE OR STM A493 ASSN STD SINGLE MATERIAL RESPONSE OR MS 5648 ASSN STD SINGLE MATERIAL RESPONSE NUT. 12 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.