The Washer,lock, cataloged under National Stock Number 5310-00-291-4042, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-291-4042 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Hardness Rating | 82.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 84.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM |
| Style Designator | FLAT INTERNAL TEETH |
| Outside Diameter | 0.394 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN |
| Material Thickness | 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN |
| Departure From Cited Document | AS MODIFIED BY SURFACE TREATMENT AND BY DIM. |
| Nondefinitive Spec/std Data | A TYPE |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.221 INCHES MINIMUM AND 0.231 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 |
|---|---|
| MILW6986TYPEA | 4/1 Identification reference U.S. Government activity |
NSN 5310-00-291-4042 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-291-4042: Surface Treatment Document and Classification: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Hardness Rating: 82.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 84.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM; Style Designator: FLAT INTERNAL TEETH; Outside Diameter: 0.394 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN. 10 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.