The Washer,flat, cataloged under National Stock Number 5310-00-121-3003, 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11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-121-3003 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | +4A-WB1A FSC-97424 MFR REF SINGLE TREATMENT RESPONSE OVERALL A |
| Overall Diameter | 0.185 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-766 1/4 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | DEE |
| Width | 0.141 INCHES NOMINAL IN |
| Material | STEEL COMP 302 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.063 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN |
| Thickness | 0.004 INCHES MINIMUM AND 0.006 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 |
|---|---|
| 7581K81P001 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-121-3003 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-121-3003: Surface Treatment Document and Classification: +4A-WB1A FSC-97424 MFR REF SINGLE TREATMENT RESPONSE OVERALL A; Overall Diameter: 0.185 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-766 1/4 HARD FED SPEC SINGLE 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.