The Washer,flat, cataloged under National Stock Number 5310-01-662-3670, 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10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-662-3670 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Overall Diameter | 0.312 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Inside Left Corner Chamfer Angle | 45.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM |
| Surface Treatment | ALUMINUM ALLOY OVERALL |
| Peripheral Shape Style | ROUND |
| Material | TITANIUM ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.174 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | ITEM IS FAA CERTIFIED |
| Thickness | 0.057 INCHES MINIMUM AND 0.069 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 |
|---|---|
| BACW10BX2CK | 3/1 Design control — primary reference U.S. Government activity |
NSN 5310-01-662-3670 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-724-1474. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-662-3670: Overall Diameter: 0.312 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Inside Left Corner Chamfer Angle: 45.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM; Surface Treatment: ALUMINUM ALLOY OVERALL. 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.