The Washer,key, cataloged under National Stock Number 5310-00-568-5255, 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 10 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 | 5310-00-568-5255 |
| Primary Part Number | S1610-23058 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Overall Distance Including Keys | 6.812 INCHES NOMINAL IN |
| Style Designator | KEY |
| Material Document and Classification | MIL-S-5059,COND A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 6.187 INCHES MINIMUM AND 6.207 INCHES MAXIMUM IN |
| Material Thickness | 0.058 INCHES NOMINAL IN |
| Width Between Flats | 5.625 INCHES NOMINAL IN |
| External Straight Key Width | 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN |
| External Key Quantity | 37 |
| Surface Treatment | PASSIVATE OVERALL |
| Hole Diameter | 5.756 INCHES MINIMUM AND 5.760 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 |
|---|---|
| S1610-23058 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
NSN 5310-00-568-5255 is a Washer,key, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-568-5255 has 1 manufacturer part number on file: S1610-23058 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for S1610-23058: Overall Distance Including Keys: 6.812 INCHES NOMINAL IN; Style Designator: KEY; Material Document and Classification: MIL-S-5059,COND A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 6.187 INCHES MINIMUM AND 6.207 INCHES MAXIMUM IN. 10 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.