The Washer,key, cataloged under National Stock Number 5310-00-978-2812, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-978-2812 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Internal Straight Key Width | 0.147 INCHES MINIMUM AND 0.152 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.664 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Distance Including Keys | 1.938 INCHES MINIMUM AND 1.943 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| Style Designator | KEY |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.792 INCHES MINIMUM AND 1.797 INCHES MAXIMUM IN |
| Material Thickness | 0.153 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN |
| External Straight Key Width | 0.147 INCHES MINIMUM AND 0.152 INCHES MAXIMUM IN |
| External Key Quantity | 2 |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL COMP 4140 OVERALL |
| Internal Key Quantity | 2 |
| Hole Diameter | 1.542 INCHES MINIMUM AND 1.547 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 |
|---|---|
| 02-14015 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-978-2812 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-978-2812: Internal Straight Key Width: 0.147 INCHES MINIMUM AND 0.152 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.664 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Distance Including Keys: 1.938 INCHES MINIMUM AND 1.943 INCHES MAXIMUM IN. 15 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.