The Washer,flat, cataloged under National Stock Number 5310-01-049-6586, 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11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-049-6586 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-698 COND 1/2 H OR H FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-698 COND 1/2 H OR H FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-698 COND 1/2 H OR H FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-698 COND 1/2 H OR H FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-698 COND 1/2 H OR H FED SPEC 5TH MATERIAL RESPONSE OR MIL-S-7952 MIL SPEC 5TH MATERIAL RESPONSE OR MIL-S-7952 MIL SPEC 6TH MATERIAL RESPONSE OR MIL-S-7952 MIL SPEC 7TH MATERIAL RESPONSE OR SAE ASSN STD 7TH MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Specification/standard Data | 81205-BACW10P MANUFACTURERS STANDARD |
| Surface Treatment | CADMIUM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1020 OR STEEL COMP 1025 OR STEEL COMP 1010 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN |
| Thickness | 0.032 INCHES NOMINAL 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 |
|---|---|
| BACW10P218S | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-049-6586 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-669-3956. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-049-6586: Surface Treatment Document and Classification: QQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-698 COND 1/2 H OR H FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-698 COND 1/2 H OR H FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-698 COND 1/2 H OR H FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-698 COND 1/2 H OR H FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-698 COND 1/2 H OR H FED SPEC 5TH MATERIAL RESPONSE OR MIL-S-7952 MIL SPEC 5TH MATERIAL RESPONSE OR MIL-S-7952 MIL SPEC 6TH MATERIAL RESPONSE OR MIL-S-7952 MIL SPEC 7TH MATERIAL RESPONSE OR SAE ASSN STD 7TH MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 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.