The Washer,lock, cataloged under National Stock Number 5310-00-774-7377, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is L3harris Technologies, Inc. Dba Harris Corporation. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-774-7377 |
| Primary Part Number | 56764 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | L3harris Technologies, Inc. Dba Harris Corporation |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 0.478 INCHES NOMINAL IN |
| Material Thickness | 0.048 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.257 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 |
|---|---|
| 56764 PRIMARY | L3harris Technologies, Inc. Dba Harris Corporation (USA) |
| Reference | Meaning |
|---|---|
| 56764 | 5/9 Secondary reference Itt Industries Inc Itt Aerospace Communications Div East |
NSN 5310-00-774-7377 is a Washer,lock, manufactured by L3harris Technologies, Inc. Dba Harris Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-774-7377 has 1 manufacturer part number on file: 56764 (L3harris Technologies, Inc. Dba Harris Corporation).
2 possible matches (shared part number, not a government interchangeability claim): 6625-01-411-4530, 2540-01-476-7719. Verify interchangeability with system specifications before substitution.
Key specifications for 56764: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 0.478 INCHES NOMINAL IN; Material Thickness: 0.048 INCHES NOMINAL IN; Surface Treatment: CADMIUM AND CHROMATE 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.