The Washer,key, cataloged under National Stock Number 5310-01-378-6249, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Nkk Switches of America Inc. Government technical data includes 6 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 | 5310-01-378-6249 |
| Primary Part Number | AT518 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Nkk Switches of America Inc |
| Status | ACTIVE |
| Outside Diameter | 0.717 INCHES NOMINAL IN |
| Material Thickness | 0.039 INCHES NOMINAL IN |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| External Prebent Key Width | 0.110 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Hole Diameter | 0.402 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 |
|---|---|
| AT518 PRIMARY | Nkk Switches of America Inc (USA) |
NSN 5310-01-378-6249 is a Washer,key, manufactured by Nkk Switches of America Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-378-6249 has 1 manufacturer part number on file: AT518 (Nkk Switches of America Inc).
Key specifications for AT518: Outside Diameter: 0.717 INCHES NOMINAL IN; Material Thickness: 0.039 INCHES NOMINAL IN; Surface Treatment: ZINC AND CHROMATE OVERALL; External Prebent Key Width: 0.110 INCHES NOMINAL IN. 6 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.