The Nut,self-Locking,round, cataloged under National Stock Number 5310-01-139-6791, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Century Fasteners Corp. Dba Century Fasteners Corp. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-139-6791 |
| Primary Part Number | 5C-20 |
| Item Name | Nut,self-Locking,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Century Fasteners Corp. Dba Century Fasteners Corp |
| Status | ACTIVE |
| Thread Series | UNS |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.664 INCHES IN |
| Nut Diameter | 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN |
| Drive Point Depth | 0.080 INCHES NOMINAL IN |
| Locking Feature | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| Nut Thickness | 0.315 INCHES NOMINAL IN |
| Drive Point Diameter | 0.092 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN |
| Surface Treatment | OXIDE OVERALL EXCEPT INSERT |
| Drive Point Quantity | 4 |
| Nut Style | ROUND |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 4130 OVERALL EXCEPT INSERT |
| 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 |
|---|---|
| 5C-20 PRIMARY | Century Fasteners Corp. Dba Century Fasteners Corp (USA) |
| 50-20 PRIMARY | Century Fasteners Corp. Dba Century Fasteners Corp (USA) |
| Reference | Meaning |
|---|---|
| 10109773 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| SL7105 | 3/2 Design control — primary reference U.S. Government activity |
| 2493734 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 5310-01-139-6791 is a Nut,self-Locking,round, manufactured by Century Fasteners Corp. Dba Century Fasteners Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-139-6791 has 2 manufacturer part numbers on file: 5C-20 (Century Fasteners Corp. Dba Century Fasteners Corp), 50-20 (Century Fasteners Corp. Dba Century Fasteners Corp).
Key specifications for 5C-20: Thread Series: UNS; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.664 INCHES IN; Nut Diameter: 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN. 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.