The Washer,key, cataloged under National Stock Number 5310-01-128-6678, 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12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-128-6678 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES ALL SURFACES |
| Internal Straight Key Width | 0.406 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 1.695 INCHES NOMINAL IN |
| Overall Distance Including Keys | 3.900 INCHES MINIMUM AND 3.920 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 3.730 INCHES MINIMUM AND 3.739 INCHES MAXIMUM IN |
| Material Thickness | 0.051 INCHES MINIMUM AND 0.061 INCHES MAXIMUM IN |
| External Straight Key Width | 0.230 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN |
| External Key Quantity | 3 |
| Internal Key Quantity | 4 |
| Hole Diameter | 3.516 INCHES MINIMUM AND 3.525 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 |
|---|---|
| 10109500 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 3027T74P01 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-128-6678 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-128-6678: Surface Finish: 63.0 MICROINCHES ALL SURFACES; Internal Straight Key Width: 0.406 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 1.695 INCHES NOMINAL IN; Overall Distance Including Keys: 3.900 INCHES MINIMUM AND 3.920 INCHES MAXIMUM IN. 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.