The Washer,lock, cataloged under National Stock Number 5310-00-012-0379, 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10 specifications, cited from the U.S. Government catalog. 16 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5310-00-012-0379 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | CANCELLED |
| Surface Treatment Document and Classification | QQ-P-416 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| Hardness Rating | 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Material Document and Classification | FED STD 66,AISI C1060 THRU C1080 OR SAE 1060 THRU 1080 FED STD ALL MATERIAL RESPONSES OVERALL |
| Outside Diameter | 0.575 INCHES NOMINAL IN |
| Material Thickness | 0.056 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 1 STYLE AND A CLASS |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.319 INCHES MINIMUM AND 0.333 INCHES MAXIMUM IN |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 56436 | 5/9 Secondary reference U.S. Government activity |
| 10-20395 | 5/9 Secondary reference Teledyne Industries Inc Teledyne Power Systems Div |
| 5310000120379 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| FIG2213-5-16 | 5/9 Secondary reference Allen W D Mfg Co |
| FFW84CLASSASTYLE1 | 4/1 Identification reference U.S. Government activity |
| 120379 | 5/1 Secondary reference General Motors Corp |
| 7744771 | 5/1 Secondary reference U S Army Tank Automotive Command Amsta-Im-Mm |
| MS35337-26 | 2/2 Government specification standardization U.S. Government activity |
| FC6783 | 5/9 Secondary reference U.S. Government activity |
| 10-20395 | 5/9 Secondary reference Unison Industries Llc |
| 496D | 5/1 Secondary reference Lincoln Electric Holdings Inc |
| V11-1-030 | 5/1 Secondary reference U.S. Government activity |
| 120379 | 5/1 Secondary reference Us Army Aviation and Missile Command |
| 10113 | 5/1 Secondary reference U.S. Government activity |
| 10-20395 | 5/9 Secondary reference Amphenol Corp Div Amphenol Aerospace Operations |
| 393 | 5/1 Secondary reference Black and Decker Us Inc |
NSN 5310-00-012-0379 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: cancelled.
3 possible matches (shared part number, not a government interchangeability claim): 3110-00-143-2961, 5210-00-273-1960, 5310-00-641-9939. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-012-0379: Surface Treatment Document and Classification: QQ-P-416 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 2ND TREATMENT RESPONSE OVERALL; Hardness Rating: 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM; Style Designator: SPLIT HELICAL-RIGHT HAND; Material Document and Classification: FED STD 66,AISI C1060 THRU C1080 OR SAE 1060 THRU 1080 FED STD ALL MATERIAL RESPONSES OVERALL. 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.
NSN 5310-00-012-0379 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.