The Washer,key, cataloged under National Stock Number 5310-01-053-9804, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-053-9804 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Distance From Centerline to Top of Internal Key | 0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-13924,CL I MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM |
| Style Designator | KEY |
| Material Document and Classification | MIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.900 INCHES NOMINAL IN |
| Material Thickness | 0.050 INCHES NOMINAL IN |
| Surface Treatment | OXIDE FILM OVERALL |
| Material | STEEL COMP 4130 OVERALL |
| Internal Key Quantity | 1 |
| Hole Diameter | 0.792 INCHES MINIMUM AND 0.795 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 |
|---|---|
| 1647146-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-053-9804 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-053-9804: Distance From Centerline to Top of Internal Key: 0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-13924,CL I MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Hardness Rating: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM; Style Designator: KEY. 11 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.