The Washer,key, cataloged under National Stock Number 5310-00-161-0560, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-161-0560 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES ALL SURFACES |
| Internal Straight Key Width | 0.230 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.168 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 4.235 INCHES MINIMUM AND 4.245 INCHES MAXIMUM IN |
| Hardness Rating | 24.0 ROCKWELL C MINIMUM |
| Style Designator | KEY |
| Material Document and Classification | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 3.970 INCHES MINIMUM AND 3.990 INCHES MAXIMUM IN |
| Material Thickness | 0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN |
| External Straight Key Width | 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN |
| External Key Quantity | 3 |
| Material | STEEL OVERALL |
| Internal Key Quantity | 4 |
| Hole Diameter | 3.630 INCHES MINIMUM AND 3.650 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 |
|---|---|
| 3020T69P01 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-161-0560 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-161-0560: Surface Finish: 63.0 MICROINCHES ALL SURFACES; Internal Straight Key Width: 0.230 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.168 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN; Overall Distance Including Keys: 4.235 INCHES MINIMUM AND 4.245 INCHES MAXIMUM IN. 14 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.