The Washer,lock, cataloged under National Stock Number 5310-01-251-9276, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-251-9276 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | ASTM B633,TY 2,CL 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | FLAT EXTERNAL TEETH |
| Material Document and Classification | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| Outside Diameter | 0.494 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Material Thickness | 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 2 TYPE AND 1 STYLE AND 1 COMPOSITION |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Material | STEEL COMP 1050 OR STEEL COMP 1053 OR STEEL COMP 1054 OR STEEL COMP 1055 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1064 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 |
|---|---|
| 02382 | 5/1 Secondary reference U.S. Government activity |
| MS51414-4 | 2/2 Government specification standardization U.S. Government activity |
| FF-W-100 | 4/1 Identification reference U.S. Government activity |
| PL9 2559 00 100-62 | 5/1 Secondary reference U.S. Government activity |
NSN 5310-01-251-9276 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 6210-01-262-8456, 6550-01-316-8747. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-251-9276: Surface Treatment Document and Classification: ASTM B633,TY 2,CL 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Style Designator: FLAT EXTERNAL TEETH; Material Document and Classification: 66 FED STD ALL MATERIAL RESPONSES OVERALL; Outside Diameter: 0.494 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN. 9 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.