The Washer,key, cataloged under National Stock Number 5310-01-141-9639, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Trident Maritime Systems Uk Limited. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-141-9639 |
| Primary Part Number | 20574/200.1 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Trident Maritime Systems Uk Limited |
| Status | ACTIVE |
| External Prebent Key Length | 0.064 INCHES NOMINAL IN |
| Material Document and Classification | BS970,PT.4,416S41,FSCM K0639 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.382 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Material Thickness | 0.050 INCHES MINIMUM AND 0.051 INCHES MAXIMUM IN |
| External Key Quantity | 1 |
| External Prebent Key Width | 0.061 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Diameter | 0.187 INCHES MINIMUM AND 0.189 INCHES MAXIMUM 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 |
|---|---|
| 20574/200.1 PRIMARY | Trident Maritime Systems Uk Limited (GBR) |
| Reference | Meaning |
|---|---|
| 20574/200.1 | 3/9 Design control — primary reference Aeronautical & General Instruments Limited |
NSN 5310-01-141-9639 is a Washer,key, manufactured by Trident Maritime Systems Uk Limited, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-141-9639 has 1 manufacturer part number on file: 20574/200.1 (Trident Maritime Systems Uk Limited).
Key specifications for 20574/200.1: External Prebent Key Length: 0.064 INCHES NOMINAL IN; Material Document and Classification: BS970,PT.4,416S41,FSCM K0639 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.382 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN; Material Thickness: 0.050 INCHES MINIMUM AND 0.051 INCHES MAXIMUM IN. 8 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.