The Nut,plain,extended Washer,hexago, cataloged under National Stock Number 5310-01-247-7981, 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16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-247-7981 |
| Item Name | Nut,plain,extended Washer,hexago |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Washer Outside Diameter | 4.375 INCHES NOMINAL IN |
| Width Across Flats | 3.500 INCHES NOMINAL IN |
| Hole Thread Quantity Per Inch | 18 |
| Thread Series | UN |
| Criticality Code Justification | ZZZY |
| Hole Configuration Style | CONFIGURATION A |
| Material Document and Classification | ASTM B148 GR9C-HT ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.750 INCHES IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Hole Nominal Thread Diameter | 0.312 INCHES IN |
| Thread Quantity Per Inch | 12 |
| Material | COPPER ALLOY OVERALL |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL. MANUFACTURING AND TESTING SPECIFICATIONS. |
| Hole Type and Quantity | 2 TAPPED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 0900-333PC64A | 3/1 Design control — primary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 5310-01-247-7981 is a Nut,plain,extended Washer,hexago, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-247-7981: Overall Height: 1.000 INCHES NOMINAL IN; Washer Outside Diameter: 4.375 INCHES NOMINAL IN; Width Across Flats: 3.500 INCHES NOMINAL IN; Hole Thread Quantity Per Inch: 18. 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.