The Washer,concave, cataloged under National Stock Number 5310-01-365-7269, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-365-7269 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES TOP |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM |
| Style Designator | CONCAVE |
| Material Document and Classification | MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.505 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Material Thickness | 0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP 8740 OR STEEL COMP 4130 OVERALL |
| Hole Diameter | 0.345 INCHES MINIMUM AND 0.355 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 |
|---|---|
| M45595/7-02 | 2/2 Government specification standardization U.S. Government activity |
| MIL-W-45595/7 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-365-7269 is a Washer,concave, classified under FSC 5310, Nuts and Washers. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 5310-01-372-9269, 5310-01-392-1854, 5310-01-468-1694. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-365-7269: Surface Finish: 32.0 MICROINCHES TOP; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM. 11 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.