The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-00-052-6754, 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 16 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-00-052-6754 |
| Primary Part Number | H42-7 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.708 INCHES MAXIMUM IN |
| Width Across Flats | 0.494 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Washer Thickness | 0.035 INCHES MINIMUM IN |
| Material Document and Classification | MS5525 MIL STD 1ST MATERIAL RESPONSE OR AMS 5732 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5735 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.438 INCHES IN |
| Specification/standard Data | 80205-NAS1291 GOVERNMENT STANDARD |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Countersink Angle | 120.0 DEGREES NOMINAL NUT |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OR IRON ALLOY 660 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 |
|---|---|
| H42-7 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| NAS1291C7M | Aviation Spares and Repairs Ltd (GBR) |
| H42-7 | Satair A/s (DNK) |
| G440028-1 | L3harris Technologies, Inc Div Space & Airborne Systems (USA) |
| Reference | Meaning |
|---|---|
| 10116517 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| P35017 | 5/1 Secondary reference Martin-Baker Aircraft Company Limited |
| NAS1291C7M | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-052-6754 is a Nut,self-Locking,extended Washer, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-052-6754 has 4 manufacturer part numbers on file: H42-7 (Howmet Global Fastening Systems Inc), NAS1291C7M (Aviation Spares and Repairs Ltd), H42-7 (Satair A/s), G440028-1 (L3harris Technologies, Inc Div Space & Airborne Systems).
Key specifications for H42-7: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.313 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN; Washer Outside Diameter: 0.708 INCHES MAXIMUM IN; Width Across Flats: 0.494 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN. 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.