The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-00-452-6750, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bristol Industries, Llc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-452-6750 |
| Primary Part Number | AS20628 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bristol Industries, Llc |
| Status | ACTIVE |
| Washer Outside Diameter | 0.692 INCHES MAXIMUM IN |
| Width Across Flats | 0.556 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNF |
| Precious Material | SILVER |
| Temp Rating | 1200.0 FAHRENHEIT MAXIMUM DEGF |
| Washer Thickness | 0.082 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.438 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | SILVER OVERALL |
| Precious Material and Location | OVERALL SILVER |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | 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 |
|---|---|
| AS20628 | Sae International Dba Sae International (USA) |
| AS20628 PRIMARY | Bristol Industries, Llc (USA) |
| 65015-720 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| AS20628 | 5/9 Secondary reference Society of British Aerospace Companies Ltd (sbac) |
| LH3417-070 | 5/9 Secondary reference Harvard Industries Inc |
NSN 5310-00-452-6750 is a Nut,self-Locking,extended Washer, manufactured by Bristol Industries, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-452-6750 has 3 manufacturer part numbers on file: AS20628 (Sae International Dba Sae International), AS20628 (Bristol Industries, Llc), 65015-720 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for AS20628: Overall Height: 0.469 INCHES MAXIMUM IN; Washer Outside Diameter: 0.692 INCHES MAXIMUM IN; Width Across Flats: 0.556 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 17 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.