The Washer,key, cataloged under National Stock Number 5310-01-124-1261, 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 14 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 | 5310-01-124-1261 |
| Primary Part Number | 64351-11217-102 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Surface Finish | 90.0 MICROINCHES ALL SURFACES |
| Internal Straight Key Width | 0.240 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 1.380 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-C-13924,CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM |
| Style Designator | KEY |
| Material Document and Classification | MIL-S-18729,COND N MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 4.250 INCHES NOMINAL IN |
| Material Thickness | 0.090 INCHES NOMINAL IN |
| Surface Treatment | OXIDE FILM OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Material | STEEL COMP 4130 OVERALL |
| Internal Key Quantity | 2 |
| Hole Diameter | 3.250 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 |
|---|---|
| 64351-11217-102 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
NSN 5310-01-124-1261 is a Washer,key, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-124-1261 has 1 manufacturer part number on file: 64351-11217-102 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for 64351-11217-102: Surface Finish: 90.0 MICROINCHES ALL SURFACES; Internal Straight Key Width: 0.240 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 1.380 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-C-13924,CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.