The Nut,self-Locking,assembled Washe, cataloged under National Stock Number 5310-01-131-9867, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 20 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-131-9867 |
| Primary Part Number | ST3M774A4 |
| Item Name | Nut,self-Locking,assembled Washe |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.515 INCHES NOMINAL IN |
| Width Across Flats | 0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Material Document and Classification | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE NUT |
| Material Document and Classification | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE WASHER |
| Nut Counterbore Depth | 0.065 INCHES NOMINAL NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Counterbore Diameter | 0.277 INCHES MINIMUM AND 0.287 INCHES MAXIMUM NUT IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.090 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE WASHER |
| Surface Treatment | PASSIVATE NUT |
| Nut Style | FLAT |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 NUT |
| Material | IRON ALLOY 660 WASHER |
| 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 |
|---|---|
| ST3M774A4 PRIMARY | The Boeing Company Div Defense (USA) |
| H51120A4 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BH01622A4 PRIMARY | Bristol Industries, Llc (USA) |
| Reference | Meaning |
|---|---|
| 10109622 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| H51120A4 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Microdot Products |
| VN376D4W | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-131-9867 is a Nut,self-Locking,assembled Washe, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-131-9867 has 3 manufacturer part numbers on file: ST3M774A4 (The Boeing Company Div Defense), H51120A4 (Howmet Global Fastening Systems Inc), BH01622A4 (Bristol Industries, Llc).
Key specifications for ST3M774A4: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.292 INCHES MAXIMUM IN; Washer Outside Diameter: 0.515 INCHES NOMINAL IN; Width Across Flats: 0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN. 20 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.