The Washer,lock, cataloged under National Stock Number 5310-01-566-0738, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fascan International, Inc.. Government technical data includes 1 specification, 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. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-566-0738 |
| Primary Part Number | MIL-001-335 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fascan International, Inc. |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| 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 |
|---|---|
| 53001 | Parts Associates, Inc. Dba P a I (USA) |
| MIL-001-335 PRIMARY | Fascan International, Inc. (USA) |
NSN 5310-01-566-0738 is a Washer,lock, manufactured by Fascan International, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-566-0738 has 2 manufacturer part numbers on file: 53001 (Parts Associates, Inc. Dba P a I), MIL-001-335 (Fascan International, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 5305-01-602-5908, 2510-01-670-0749. Verify interchangeability with system specifications before substitution.
Key specifications for MIL-001-335: Style Designator: SPLIT HELICAL-RIGHT HAND; Special Features: NUMBER 10, GRADE 8; Part Name Assigned by Controlling Agency: LOCKWASHER; End Item Identification: 2590-01-558-3273 INTERROGATION ARM ASSEMBLY. 1 specification is 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.