The Washer,key, cataloged under National Stock Number 5310-00-261-4479, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Emerson Power Transmission Corporation Dba Emerson Div Emerson Power Transmission Division. Government technical data includes 9 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-261-4479 |
| Primary Part Number | 740-3-00009-1 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Emerson Power Transmission Corporation Dba Emerson Div Emerson Power Transmission Division |
| Status | ACTIVE |
| Overall Distance Including Keys | 2.500 INCHES NOMINAL2.500 INCHES NOMINAL IN |
| Style Designator | KEYKEY |
| Outside Diameter | 1.500 INCHES NOMINAL1.500 INCHES NOMINAL IN |
| Material Thickness | 0.030 INCHES NOMINAL0.030 INCHES NOMINAL IN |
| External Straight Key Width | 0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN |
| External Key Quantity | 88 |
| Surface Treatment | CADMIUM AND CADMIUM AND CHROMATE OVERALLCHROMATE OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 1.055 INCHES NOMINAL1.055 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 |
| Part Number | Manufacturer |
|---|---|
| 740-3-00009-1 PRIMARY | Emerson Power Transmission Corporation Dba Emerson Div Emerson Power Transmission Division (USA) |
NSN 5310-00-261-4479 is a Washer,key, manufactured by Emerson Power Transmission Corporation Dba Emerson Div Emerson Power Transmission Division, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-261-4479 has 1 manufacturer part number on file: 740-3-00009-1 (Emerson Power Transmission Corporation Dba Emerson Div Emerson Power Transmission Division).
Key specifications for 740-3-00009-1: Overall Distance Including Keys: 2.500 INCHES NOMINAL2.500 INCHES NOMINAL IN; Style Designator: KEYKEY; Outside Diameter: 1.500 INCHES NOMINAL1.500 INCHES NOMINAL IN; Material Thickness: 0.030 INCHES NOMINAL0.030 INCHES NOMINAL IN. 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.