The Washer,key, cataloged under National Stock Number 5310-01-320-7175, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fastener Technology Corp. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-320-7175 |
| Primary Part Number | FT1761-8P |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fastener Technology Corp |
| Status | ACTIVE |
| Internal Straight Key Width | 0.032 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.05675 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | KEY |
| Material Document and Classification | MIL-S-25043 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.266 INCHES MINIMUM AND 0.286 INCHES MAXIMUM IN |
| Material Thickness | 0.028 INCHES MINIMUM AND 0.038 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 631 OVERALL |
| Internal Key Quantity | 2 |
| Hole Diameter | 0.171 INCHES MINIMUM AND 0.181 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 |
|---|---|
| G371929-1 | Raytheon Company (USA) |
| G371929-1 | Raytheon Company Dba Raytheon Co (USA) |
| FT1761-8P PRIMARY | Fastener Technology Corp (USA) |
| Reference | Meaning |
|---|---|
| G371929-1 | 5/9 Secondary reference Raytheon Company Div Corp |
| 560R537H02 | 5/2 Secondary reference U.S. Government activity |
| 82639-2 | 5/9 Secondary reference United Technologies Corp Hamilton Sundstrand Corp |
| 82639-2 | 7/2 Vendor item drawing reference Hamilton Sundstrand Corporation Dba Collins Aerospace |
| 76000187-005 | 7/2 Vendor item drawing reference Lockheed Martin Corporation |
NSN 5310-01-320-7175 is a Washer,key, manufactured by Fastener Technology Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-320-7175 has 3 manufacturer part numbers on file: G371929-1 (Raytheon Company), G371929-1 (Raytheon Company Dba Raytheon Co), FT1761-8P (Fastener Technology Corp).
2 possible matches (shared part number, not a government interchangeability claim): 5325-01-472-3948, 5985-01-491-4238. Verify interchangeability with system specifications before substitution.
Key specifications for FT1761-8P: Internal Straight Key Width: 0.032 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.05675 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: KEY. 11 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.