The Washer,flat, cataloged under National Stock Number 5310-01-657-4900, 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10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-657-4900 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | FINISH AND LUBRICATION PER MIL-L-46010SUP MIL SPEC 1ST TREATMENT RESPONSE OR SAE AS5272 TYPE I PER AS5272SUP NATIONAL STD/SPEC 2ND TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN |
| Material Document and Classification | AMS-QQ-A-250/5,T3 OR T4 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Specification/standard Data | 81205-BACW10P MANUFACTURERS STANDARD |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN |
| Thickness | 0.016 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 |
|---|---|
| BACW10P225AX | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-657-4900 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-657-4900: Surface Treatment Document and Classification: FINISH AND LUBRICATION PER MIL-L-46010SUP MIL SPEC 1ST TREATMENT RESPONSE OR SAE AS5272 TYPE I PER AS5272SUP NATIONAL STD/SPEC 2ND TREATMENT RESPONSE OVERALL; Overall Diameter: 0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN; Material Document and Classification: AMS-QQ-A-250/5,T3 OR T4 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 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.
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.