The Washer,key, cataloged under National Stock Number 5310-00-944-2599, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-944-2599 |
| Primary Part Number | 65251-08031-101 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| External Straight Key Length | 0.380 INCHES NOMINAL IN |
| Overall Distance Including Keys | 2.500 INCHES NOMINAL IN |
| Hardness Rating | 43.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.700 INCHES MINIMUM AND 1.710 INCHES MAXIMUM IN |
| External Straight Key Width | 0.180 INCHES NOMINAL IN |
| External Key Quantity | 4 |
| Material | STEEL COMP 4340 OVERALL |
| Hole Diameter | 1.510 INCHES MINIMUM AND 1.520 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 |
|---|---|
| 65251-08031-101 | Airbus Deutschland Gmbh -Werk Bremen- (DEU) |
| 65251-08031-101 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
NSN 5310-00-944-2599 is a Washer,key, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-944-2599 has 2 manufacturer part numbers on file: 65251-08031-101 (Airbus Deutschland Gmbh -Werk Bremen-), 65251-08031-101 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for 65251-08031-101: External Straight Key Length: 0.380 INCHES NOMINAL IN; Overall Distance Including Keys: 2.500 INCHES NOMINAL IN; Hardness Rating: 43.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM; Material Document and Classification: MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 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.