The Washer,key, cataloged under National Stock Number 5310-00-918-4840, 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11 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-918-4840 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Internal Straight Key Width | 0.360 INCHES NOMINAL IN |
| Overall Distance Including Keys | 4.061 INCHES NOMINAL IN |
| Outside Diameter | 3.832 INCHES NOMINAL IN |
| Material Thickness | 0.050 INCHES NOMINAL IN |
| External Straight Key Width | 0.164 INCHES NOMINAL IN |
| External Key Quantity | 4 |
| Color | BLACK OVERALL |
| Surface Treatment | OXIDE OVERALL |
| Material | STEEL OVERALL |
| Internal Key Quantity | 2 |
| Hole Diameter | 3.381 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 |
|---|---|
| 4002T66P01 | 5/9 Secondary reference Essex Engineering, Inc. Dba Essex Engineering & Manufacturing Co |
| 4002T66P01 | 5/9 Secondary reference Berkshire Manufactured Products, Inc. Dba Pursuit Aerospace |
| 4002T66P01 | 5/9 Secondary reference B-C-D Metal Products, Inc |
| 4002T66P01 | 5/9 Secondary reference General Electric Company |
| 4002T66P01 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-918-4840 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-00-918-4840: Internal Straight Key Width: 0.360 INCHES NOMINAL IN; Overall Distance Including Keys: 4.061 INCHES NOMINAL IN; Outside Diameter: 3.832 INCHES NOMINAL IN; Material Thickness: 0.050 INCHES NOMINAL IN. 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.