The Nut,self-Locking,clinch, cataloged under National Stock Number 5310-00-809-3581, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 16 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 | 5310-00-809-3581 |
| Primary Part Number | 50FMP20-440 |
| Item Name | Nut,self-Locking,clinch |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Lubrication | SOLUBLE LUBRICANT |
| Width Across Flats | 0.181 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN |
| Thread Series | UNJC |
| Material Document and Classification | CQMP 18-8 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nut Counterbore Depth | 0.072 INCHES MINIMUM AND 0.082 INCHES MAXIMUM NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.112 INCHES IN |
| Counterbore Diameter | 0.133 INCHES MINIMUM AND 0.136 INCHES MAXIMUM NUT IN |
| Pilot Diameter | 0.168 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN |
| Pilot Length | 0.084 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.206 INCHES MINIMUM AND 0.212 INCHES MAXIMUM IN |
| Nut Style | CLINCH |
| Thread Class | 3B |
| Thread Quantity Per Inch | 40 |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| 50FMP20-440 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
NSN 5310-00-809-3581 is a Nut,self-Locking,clinch, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-809-3581 has 1 manufacturer part number on file: 50FMP20-440 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 50FMP20-440: Lubrication: SOLUBLE LUBRICANT; Width Across Flats: 0.181 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN; Thread Series: UNJC; Material Document and Classification: CQMP 18-8 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL. 16 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.