The Washer,key, cataloged under National Stock Number 5310-00-209-4103, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-209-4103 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Distance From Centerline to Inside of Prebent Key | 0.244 INCHES NOMINAL IN |
| External Prebent Key Length | 0.026 INCHES MINIMUM AND 0.029 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 0.478 INCHES NOMINAL IN |
| Style Designator | KEY |
| Material Document and Classification | -AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.433 INCHES MINIMUM AND 0.443 INCHES MAXIMUM IN |
| Material Thickness | 0.030 INCHES MINIMUM AND 0.032 INCHES MAXIMUM IN |
| External Straight Key Width | 0.089 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| External Prebent Key Width | 0.089 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN |
| Material | STEEL COMP 302 OVERALL |
| Hole Diameter | 0.188 INCHES MINIMUM AND 0.189 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 |
| Reference | Meaning |
|---|---|
| K5074-2 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5310-00-209-4103 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-209-4103: Distance From Centerline to Inside of Prebent Key: 0.244 INCHES NOMINAL IN; External Prebent Key Length: 0.026 INCHES MINIMUM AND 0.029 INCHES MAXIMUM IN; Overall Distance Including Keys: 0.478 INCHES NOMINAL IN; Style Designator: KEY. 12 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.