The Washer,lock, cataloged under National Stock Number 5310-01-264-5077, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Knight Aerospace Products, Inc.. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-264-5077 |
| Primary Part Number | 3691-9 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Knight Aerospace Products, Inc. |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 0.683 INCHES NOMINAL IN |
| Material Thickness | 0.094 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.375 INCHES NOMINAL IN |
| 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 |
|---|---|
| 3691-9 PRIMARY | Knight Aerospace Products, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3691-9 | 5/9 Secondary reference Page Avjet Support Equipment Corp |
NSN 5310-01-264-5077 is a Washer,lock, manufactured by Knight Aerospace Products, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-264-5077 has 1 manufacturer part number on file: 3691-9 (Knight Aerospace Products, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5120-01-669-3407. Verify interchangeability with system specifications before substitution.
Key specifications for 3691-9: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 0.683 INCHES NOMINAL IN; Material Thickness: 0.094 INCHES NOMINAL IN; Surface Treatment: CADMIUM OVERALL. 6 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.