The Washer,flat, cataloged under National Stock Number 5310-01-180-5975, 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12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-180-5975 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES ALL SURFACES |
| Outside Left Corner Chamfer Angle | 40.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM |
| Overall Diameter | 0.458 INCHES MINIMUM AND 0.468 INCHES MAXIMUM IN |
| Hardness Rating | 55.0 ROCKWELL C MINIMUM AND 59.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | QQ-S-763 COND A,440C FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Outside Right Corner Chamfer Angle | 40.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.318 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN |
| Thickness | 0.085 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 |
|---|---|
| 3829556-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-180-5975 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-180-5975: Surface Finish: 32.0 MICROINCHES ALL SURFACES; Outside Left Corner Chamfer Angle: 40.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM; Overall Diameter: 0.458 INCHES MINIMUM AND 0.468 INCHES MAXIMUM IN; Hardness Rating: 55.0 ROCKWELL C MINIMUM AND 59.0 ROCKWELL C MAXIMUM. 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.