The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-031-2124, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-031-2124 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Width Across Flats | 1.938 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Hardness Rating | 24.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| Criticality Code Justification | ZZZX |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.250 INCHES IN |
| Departure From Cited Designator | QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Nondefinitive Spec/std Data | 3 TYPE AND 4 GRADE |
| Nut Height | 1.187 INCHES MINIMUM AND 1.251 INCHES MAXIMUM IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 7 |
| Material | STEEL OVERALL |
| Bearing Surface Type | WASHER FACED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| 6440-309 PIECE F121L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| MIL-S-1222 | 5/9 Secondary reference U.S. Government activity |
| MIL-DTL-1222 | 4/1 Identification reference U.S. Government activity |
| 6440-309 PIECE F121 | 3/1 Design control — primary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| MIL-S-1222L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 5310-01-031-2124 is a Nut,plain,hexagon, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-031-2124: Width Across Flats: 1.938 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Hardness Rating: 24.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM; Criticality Code Justification: ZZZX. 14 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.