The Washer,lock, cataloged under National Stock Number 5310-01-219-7218, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-219-7218 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Hardness Rating | 85.0 ROCKWELL B MINIMUM AND 95.0 ROCKWELL B MAXIMUM |
| Style Designator | FLAT INTERNAL TEETH |
| Material Document and Classification | QQ-B-750 FED SPEC 1ST MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.395 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN |
| Material Thickness | 0.016 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 1 TYPE AND A GRADE AND 3 COMPOSITION OR 4 COMPOSITION |
| Material | COPPER ALLOY 510 OR COPPER ALLOY 425 OVERALL |
| Hole Diameter | 0.256 INCHES MINIMUM AND 0.267 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 |
|---|---|
| MS35333-145 | 2/2 Government specification standardization U.S. Government activity |
| FF-W-100 | 4/1 Identification reference U.S. Government activity |
NSN 5310-01-219-7218 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-219-7218: Hardness Rating: 85.0 ROCKWELL B MINIMUM AND 95.0 ROCKWELL B MAXIMUM; Style Designator: FLAT INTERNAL TEETH; Material Document and Classification: QQ-B-750 FED SPEC 1ST MATERIAL RESPONSE OVERALL; Outside Diameter: 0.395 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN. 8 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.