The Washer,flat, cataloged under National Stock Number 5310-01-545-8209, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fastenal Company Dba Fastenal Co. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-545-8209 |
| Primary Part Number | 90945A761 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fastenal Company Dba Fastenal Co |
| Status | ACTIVE |
| Overall Diameter | 0.468 INCHES NOMINAL IN |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.255 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 |
|---|---|
| MC90945A761 | Dillon Aero, Inc. (USA) |
| 9900340 | Fastenal Company Dba Fastenal Co (USA) |
| 90945A761 PRIMARY | Fastenal Company Dba Fastenal Co (USA) |
| Reference | Meaning |
|---|---|
| 90945A761 | 5/9 Secondary reference Mcmaster-Carr Supply Co |
NSN 5310-01-545-8209 is a Washer,flat, manufactured by Fastenal Company Dba Fastenal Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-545-8209 has 3 manufacturer part numbers on file: MC90945A761 (Dillon Aero, Inc.), 9900340 (Fastenal Company Dba Fastenal Co), 90945A761 (Fastenal Company Dba Fastenal Co).
Key specifications for 90945A761: Overall Diameter: 0.468 INCHES NOMINAL IN; Special Features: 1/4" SCREW SIZE;THICKNESS MIN-MAX 0.059-0.067; Peripheral Shape Style: ROUND; Part Name Assigned by Controlling Agency: FLAT WASHER. 5 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.