The Washer,flat, cataloged under National Stock Number 5310-01-080-9221, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Engineered Magnetics, Inc. Dba Engineered Magnetics. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-080-9221 |
| Primary Part Number | 221131-1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Engineered Magnetics, Inc. Dba Engineered Magnetics |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.217 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-766 COND A FINISH 2B FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 304 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.144 INCHES MINIMUM AND 0.148 INCHES MAXIMUM IN |
| Thickness | 0.011 INCHES MINIMUM AND 0.013 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 |
| Part Number | Manufacturer |
|---|---|
| 221131-1 PRIMARY | Engineered Magnetics, Inc. Dba Engineered Magnetics (USA) |
NSN 5310-01-080-9221 is a Washer,flat, manufactured by Engineered Magnetics, Inc. Dba Engineered Magnetics, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-080-9221 has 1 manufacturer part number on file: 221131-1 (Engineered Magnetics, Inc. Dba Engineered Magnetics).
Key specifications for 221131-1: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.217 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-766 COND A FINISH 2B FED 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.