The Washer,key, cataloged under National Stock Number 5310-01-208-4146, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-208-4146 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Internal Straight Key Width | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 1.552 INCHES MINIMUM AND 1.562 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | ASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Outside Diameter | 4.720 INCHES MINIMUM AND 4.780 INCHES MAXIMUM IN |
| Material Thickness | 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Material | STEEL COMP 1018 OR STEEL COMP 1020 OR STEEL COMP 1025 OVERALL |
| Internal Key Quantity | 1 |
| Hole Diameter | 3.443 INCHES MINIMUM AND 3.453 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 |
|---|---|
| MS21258-55 | 3/2 Design control — primary reference U.S. Government activity |
| MS21258-55 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-208-4146 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-208-4146: Internal Straight Key Width: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 1.552 INCHES MINIMUM AND 1.562 INCHES MAXIMUM IN; Style Designator: KEY; Material Document and Classification: ASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL. 10 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.