The Washer,key, cataloged under National Stock Number 5310-01-656-0404, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-656-0404 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35, TYPE I, II, OR III FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Internal Prebent Key Width | 0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 4.938 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | AISI 302 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 303 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 304 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 4.236 INCHES MINIMUM AND 4.326 INCHES MAXIMUM IN |
| Material Thickness | 0.088 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN |
| External Key Quantity | 19 |
| Internal Prebent Key Length | 0.126 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| External Prebent Key Width | 0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Diameter | 3.582 INCHES MINIMUM AND 3.612 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 |
|---|---|
| MS19070-183 | 2/2 Government specification standardization U.S. Government activity |
| 211055896 | 5/9 Secondary reference U.S. Government activity |
| 754-8207763 ITEM 21 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 5310-01-656-0404 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-656-0404: Surface Treatment Document and Classification: QQ-P-35, TYPE I, II, OR III FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Internal Prebent Key Width: 0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN; Overall Distance Including Keys: 4.938 INCHES MAXIMUM IN; Style Designator: KEY. 13 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.