The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-391-4305, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-391-4305 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Washer Outside Diameter | 2.357 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416, TY2, CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Hardness Rating | 48.0 ROCKWELL C MAXIMUM |
| Washer Thickness | 0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6304 ASSN STD 1ST MATERIAL RESPONSE OR AMS 6485 ASSN STD 2ND MATERIAL RESPONSE OR AMS6487 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.375 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Drive Point Quantity | 12 |
| Nut Style | SPLINE DRIVE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP 601 OR STEEL COMP H11 OVERALL |
| 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 |
|---|---|
| MS21084-22 | 5/9 Secondary reference U.S. Government activity |
| MS21084-22 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-391-4305 is a Nut,self-Locking,extended Washer, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-391-4305: Overall Height: 1.560 INCHES MINIMUM AND 1.580 INCHES MAXIMUM IN; Washer Outside Diameter: 2.357 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416, TY2, CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF). 16 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.