The Washer,key, cataloged under National Stock Number 5310-00-448-2637, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-448-2637 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Internal Straight Key Width | 0.156 INCHES NOMINAL IN |
| Distance From Centerline to Top of Internal Key | 0.419 INCHES MINIMUM AND 0.429 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | AN-S-12 MIL SPEC 1ST MATERIAL RESPONSE OR QQ-S-685 FED SPEC 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.880 INCHES NOMINAL IN |
| Material Thickness | 0.125 INCHES NOMINAL IN |
| Material | STEEL COMP 8630 OR STEEL COMP 4130 OVERALL |
| Internal Key Quantity | 1 |
| Hole Diameter | 1.010 INCHES NOMINAL 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 |
|---|---|
| 3-95626 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-448-2637 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 1560-00-652-7440, 2990-01-198-6932. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-448-2637: Internal Straight Key Width: 0.156 INCHES NOMINAL IN; Distance From Centerline to Top of Internal Key: 0.419 INCHES MINIMUM AND 0.429 INCHES MAXIMUM IN; Style Designator: KEY; Material Document and Classification: AN-S-12 MIL SPEC 1ST MATERIAL RESPONSE OR QQ-S-685 FED SPEC 2ND MATERIAL RESPONSE OVERALL. 9 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.