The Washer,key, cataloged under National Stock Number 5310-00-078-5385, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-078-5385 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Wire Hole Diameter | 0.080 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Internal Prebent Key Width | 0.142 INCHES NOMINAL IN |
| Distance From Key Center to Wire Hole Center | 0.157 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| Style Designator | INTERNAL PREBENT KEY |
| Material Document and Classification | MIL-S-7947 COND A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.310 INCHES MINIMUM AND 1.330 INCHES MAXIMUM IN |
| Material Thickness | 0.080 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL COMP 1095 OVERALL |
| Hole Diameter | 0.940 INCHES MINIMUM AND 0.950 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 100641 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-078-5385 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
5 possible matches (shared part number, not a government interchangeability claim): 5905-00-163-2275, 3030-00-927-4157, 3110-01-276-0349. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-078-5385: Wire Hole Diameter: 0.080 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Internal Prebent Key Width: 0.142 INCHES NOMINAL IN; Distance From Key Center to Wire Hole Center: 0.157 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN. 12 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.