The Nut,plain,extended Washer,double, cataloged under National Stock Number 5310-00-948-1256, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-948-1256 |
| Primary Part Number | H29248-7 |
| Item Name | Nut,plain,extended Washer,double |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Washer Outside Diameter | 0.750 INCHES NOMINAL IN |
| Width Across Flats | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Washer Thickness | 0.070 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.438 INCHES IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| H29248-7 | Howmet Global Fastening Systems Inc (USA) |
| FNF22-720 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| LH9031-7 | 5/9 Secondary reference Harvard Industries Inc |
| C084-7 | 3/2 Design control — primary reference U.S. Government activity |
| VN415-C-070 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-00-948-1256 is a Nut,plain,extended Washer,double, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-948-1256 has 2 manufacturer part numbers on file: H29248-7 (Howmet Global Fastening Systems Inc), FNF22-720 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for H29248-7: Overall Height: 0.500 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN; Washer Outside Diameter: 0.750 INCHES NOMINAL IN; Width Across Flats: 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN; Thread Series: UNF. 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.