The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-055-4165, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-055-4165 |
| Primary Part Number | SP50959-3 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Washer Outside Diameter | 1.296 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNF |
| Temp Rating | 450.0 FAHRENHEIT MAXIMUM DEGF |
| Hardness Rating | 48.0 ROCKWELL C MAXIMUM |
| Washer Thickness | 0.090 INCHES MINIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.7500 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| SP50959-3 | Howmet Global Fastening Systems Inc (USA) |
| SP50959-12 | Howmet Global Fastening Systems Inc (USA) |
| ST3M816-12M | The Boeing Company Div Defense (USA) |
| SP50959-12 | Satair A/s (DNK) |
| SP50959-3 | Satair A/s (DNK) |
| 78688-1216 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| RMLH10722-12 | 5/9 Secondary reference Harvard Industries Inc |
| 5310PL1813225 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| MS21084L12 | 3/2 Design control — primary reference U.S. Government activity |
| MS21084L12 | 5/9 Secondary reference U.S. Government activity |
| 5310PL0743528 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| RMLH10722-12 | 5/9 Secondary reference Kerr-Mcgee Chemical Corp |
NSN 5310-01-055-4165 is a Nut,self-Locking,extended Washer, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-055-4165 has 6 manufacturer part numbers on file: SP50959-3 (Howmet Global Fastening Systems Inc), SP50959-12 (Howmet Global Fastening Systems Inc), ST3M816-12M (The Boeing Company Div Defense), SP50959-12 (Satair A/s), SP50959-3 (Satair A/s) and 1 more.
Key specifications for SP50959-3: Overall Height: 0.860 INCHES MAXIMUM IN; Washer Outside Diameter: 1.296 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNF. 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.