The Washer,flat, cataloged under National Stock Number 5310-01-641-0640, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Department of Defense Project Manager-Mobile Electric Power. Government technical data includes 9 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 | 5310-01-641-0640 |
| Primary Part Number | 04-21733 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Department of Defense Project Manager-Mobile Electric Power |
| Status | ACTIVE |
| Overall Diameter | 0.320 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | BLANK RECTANGULAR |
| Color | BLACK OVERALL |
| Surface Treatment | ZINC AND ALUMINUM ALLOY OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.160 INCHES NOMINAL IN |
| Thickness | 0.0235 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 |
| Part Number | Manufacturer |
|---|---|
| 04-21733 PRIMARY | Department of Defense Project Manager-Mobile Electric Power (USA) |
NSN 5310-01-641-0640 is a Washer,flat, manufactured by Department of Defense Project Manager-Mobile Electric Power, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-641-0640 has 1 manufacturer part number on file: 04-21733 (Department of Defense Project Manager-Mobile Electric Power).
Key specifications for 04-21733: Overall Diameter: 0.320 INCHES NOMINAL IN; Cross-Sectional Shape Style: BLANK RECTANGULAR; Color: BLACK OVERALL; Surface Treatment: ZINC AND ALUMINUM ALLOY OVERALL. 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.