The Washer,flat, cataloged under National Stock Number 5310-01-657-1779, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-657-1779 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 12.27 MILLIMETERS MINIMUM AND 12.70 MILLIMETERS MAXIMUM MM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL CORROSION RESISTING OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 5.60 MILLIMETERS MINIMUM AND 5.80 MILLIMETERS MAXIMUM MM |
| Thickness | 1.00 MILLIMETERS NOMINAL MM |
| 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 |
|---|---|
| NA0179BL050 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-657-1779 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-657-1779: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 12.27 MILLIMETERS MINIMUM AND 12.70 MILLIMETERS MAXIMUM MM; Cross-Sectional Shape Style: RECTANGULAR; Special Features: HEAT TREAT: PRECIPITATION HEAT TREAT TO 965 MP MINIMUM ULTIMATE TENSILE STRENGTH, INTENDED PRIMARILY FOR USE WITH 1100 MP ULTIMATE TENSILE BOLTS. 9 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.