The Washer,flat, cataloged under National Stock Number 5310-01-669-8634, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Flyer Defense, Llc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Washer,flat |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Flyer Defense, Llc (CAGE 1RZR5); Mcmaster-Carr Supply Co (CAGE 39428) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-669-8634 |
| Primary Part Number | 12579666 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Flyer Defense, Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| 12579666 PRIMARY | Flyer Defense, Llc (USA) |
| 90130A120 PRIMARY | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 4122 | 5/9 Secondary reference U.S. Government activity |
| 12579666 | 7/2 Vendor item drawing reference U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 5310-01-669-8634 is a Washer,flat, manufactured by Flyer Defense, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-669-8634 has 2 manufacturer part numbers on file: 12579666 (Flyer Defense, Llc), 90130A120 (Mcmaster-Carr Supply Co).
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.