The Washer,key, cataloged under National Stock Number 5310-01-650-4561, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Whittet-Higgins Company. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-650-4561 |
| Primary Part Number | MB04 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Whittet-Higgins Company |
| Status | ACTIVE |
| Overall Distance Including Keys | 36.0 MILLIMETERS NOMINAL MM |
| Style Designator | KEY |
| Outside Diameter | 26.0 MILLIMETERS NOMINAL MM |
| Material Thickness | 1.0 MILLIMETERS NOMINAL MM |
| External Key Quantity | 11 |
| Material | STEEL OVERALL |
| Hole Diameter | 20.0 MILLIMETERS NOMINAL MM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MB04 PRIMARY | Whittet-Higgins Company (USA) |
| Reference | Meaning |
|---|---|
| 13055677 | 7/2 Vendor item drawing reference Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
NSN 5310-01-650-4561 is a Washer,key, manufactured by Whittet-Higgins Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-650-4561 has 1 manufacturer part number on file: MB04 (Whittet-Higgins Company).
Key specifications for MB04: Overall Distance Including Keys: 36.0 MILLIMETERS NOMINAL MM; Style Designator: KEY; Outside Diameter: 26.0 MILLIMETERS NOMINAL MM; Material Thickness: 1.0 MILLIMETERS NOMINAL MM. 7 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.