The Washer,lock, cataloged under National Stock Number 5310-00-596-7678, 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12 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-596-7678 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 2 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TYPE 2,CLASS 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM |
| Style Designator | FLAT INTERNAL TEETH |
| Material Document and Classification | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| Outside Diameter | 0.740 INCHES MINIMUM AND 0.789 INCHES MAXIMUM IN |
| Material Thickness | 0.032 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN |
| Specification/standard Data | 81348-FF-W-100 GOVERNMENT SPECIFICATION AND 80204-B18.21.1 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 96906-MS35333BASIC/CANCELED/ GOVERNMENT STANDARD |
| Departure From Cited Document | AS MODIFIED BY OPTIONAL SURFACE TREATMENT |
| Nondefinitive Spec/std Data | 1 TYPE AND A GRADE AND 6 TABLE AND 7/16 SIZE |
| Surface Treatment | CADMIUM AND CHROMATE OR ZINC OVERALL |
| Material | STEEL COMP 1050 OR STEEL COMP 1064 OVERALL |
| Hole Diameter | 0.448 INCHES MINIMUM AND 0.464 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 |
|---|---|
| 131718 | 5/9 Secondary reference U S Army Tank Automotive Command Amsta-Im-Mm |
| 131718 | 5/1 Secondary reference General Motors Corp |
| MS35333-26 | 2/2 Government specification standardization U.S. Government activity |
| FF-W-100 | 4/1 Identification reference U.S. Government activity |
| ANSI B18.21.1TYPE A TABLE 6-7/16 | 5/1 Secondary reference U.S. Government activity |
NSN 5310-00-596-7678 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5305-00-903-5522. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-596-7678: Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 2 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TYPE 2,CLASS 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM; Style Designator: FLAT INTERNAL TEETH; Material Document and Classification: 66 FED STD ALL MATERIAL RESPONSES OVERALL. 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.