The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-557-2769, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-557-2769 |
| Primary Part Number | BACN10HR4 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Washer Outside Diameter | 0.438 INCHES MAXIMUM IN |
| Width Across Flats | 0.347 INCHES MINIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Washer Thickness | 0.020 INCHES MINIMUM IN |
| Thread Direction | RIGHT-HAND |
| Counterbore Diameter | 0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM FIRST END IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| 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 |
|---|---|
| BACN10HR4 PRIMARY | The Boeing Company (USA) |
NSN 5310-01-557-2769 is a Nut,self-Locking,extended Washer, manufactured by The Boeing Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-557-2769 has 1 manufacturer part number on file: BACN10HR4 (The Boeing Company).
Key specifications for BACN10HR4: Overall Height: 0.280 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Washer Outside Diameter: 0.438 INCHES MAXIMUM IN; Width Across Flats: 0.347 INCHES MINIMUM IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF). 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.