The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-653-4325, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-653-4325 |
| Primary Part Number | 803-6397421 REV C PC NO 73 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN OR PREVAILING TORQUE WITH METALLIC INSERT OR FREE-RUNNING ALL METAL DESIGN |
| Nut Height | 0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | COPPER ALLOY OVERALL |
| Bearing Surface Type | CHAMFERED OR FLAT OR WASHER FACED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 803-6397421 REV C PC NO 73 PRIMARY | Naval Sea Systems Command (USA) |
| 99NTE-048 | Esna, Llc (USA) |
| Reference | Meaning |
|---|---|
| 803-6397421 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 5310-01-653-4325 is a Nut,self-Locking,hexagon, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-653-4325 has 2 manufacturer part numbers on file: 803-6397421 REV C PC NO 73 (Naval Sea Systems Command), 99NTE-048 (Esna, Llc).
Key specifications for 803-6397421 REV C PC NO 73: Width Across Flats: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Thread Series: UNF; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.250 INCHES IN. 11 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.