The Washer,key, cataloged under National Stock Number 5310-00-658-5299, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Leonardo Spa Helicopters Division - Production Site. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-658-5299 |
| Primary Part Number | STD3023K2 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Leonardo Spa Helicopters Division - Production Site |
| Status | ACTIVE |
| Distance From Centerline to Inside of Prebent Key | 0.295 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN |
| Split Key Length | 0.121 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN |
| External Prebent Key Length | 0.095 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 0.745 INCHES MINIMUM AND 0.765 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.488 INCHES MINIMUM AND 0.508 INCHES MAXIMUM IN |
| External Tapered Key Width | 0.244 INCHES MINIMUM AND 0.264 INCHES MAXIMUM IN |
| Material Thickness | 0.027 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN |
| External Key Quantity | 3 |
| External Prebent Key Width | 0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN |
| Material | STEEL COMP 321 OVERALL |
| Angle Between External Keys | 58.0 DEGREES MINIMUM AND 62.0 DEGREES MAXIMUM |
| Hole Diameter | 0.265 INCHES MINIMUM AND 0.270 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 |
|---|---|
| STD3023K2 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| VSTD3023K2 | Vericor Power Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| STD3023K2 | 3/9 Design control — primary reference U.S. Government activity |
| STD3023K2 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-00-658-5299 is a Washer,key, manufactured by Leonardo Spa Helicopters Division - Production Site, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-658-5299 has 2 manufacturer part numbers on file: STD3023K2 (Leonardo Spa Helicopters Division - Production Site), VSTD3023K2 (Vericor Power Systems Llc).
Key specifications for STD3023K2: Distance From Centerline to Inside of Prebent Key: 0.295 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN; Split Key Length: 0.121 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN; External Prebent Key Length: 0.095 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN; Overall Distance Including Keys: 0.745 INCHES MINIMUM AND 0.765 INCHES MAXIMUM IN. 14 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.