The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-132-4402, 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 13 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-132-4402 |
| Primary Part Number | ST3M752-7 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.773 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Washer Thickness | 0.075 INCHES MINIMUM IN |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5663 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.438 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Drive Point Quantity | 12 |
| Nut Style | SPLINE DRIVE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | NICKEL ALLOY 718 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 |
|---|---|
| ST3M752-7 PRIMARY | The Boeing Company Div Defense (USA) |
| 78686-7 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| H50609-7 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BH752-7 PRIMARY | Bristol Industries, Llc (USA) |
| Reference | Meaning |
|---|---|
| LH12038-7 | 5/9 Secondary reference Harvard Industries Inc |
| 10109647 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5310-01-132-4402 is a Nut,self-Locking,extended Washer, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-132-4402 has 4 manufacturer part numbers on file: ST3M752-7 (The Boeing Company Div Defense), 78686-7 (Sps Technologies, Llc Dba PB Fasteners), H50609-7 (Howmet Global Fastening Systems Inc), BH752-7 (Bristol Industries, Llc).
Key specifications for ST3M752-7: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.437 INCHES MAXIMUM IN; Washer Outside Diameter: 0.773 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF). 13 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.