The Washer,key, cataloged under National Stock Number 5310-00-255-3405, 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11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-255-3405 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| External Straight Key Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 2.000 INCHES NOMINAL IN |
| Style Designator | KEY |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Peening Key Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Material Thickness | 0.057 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN |
| External Straight Key Width | 0.375 INCHES NOMINAL IN |
| Material | NICKEL ALLOY A OVERALL |
| Hole Diameter | 0.771 INCHES MINIMUM AND 0.791 INCHES MAXIMUM IN |
| Reference Number Differentiating Characteristics | BOLT SIZE AND MATERIAL |
| 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 |
|---|---|
| 00243-2 | 5/9 Secondary reference Defense Logistics Agency Dba Defense Supply Center Philadelphia |
| S7406 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5310-00-255-3405 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 2040-00-972-8641, 4130-01-335-2455. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-255-3405: External Straight Key Length: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN; Overall Distance Including Keys: 2.000 INCHES NOMINAL IN; Style Designator: KEY; Material Document and Classification: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 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.