The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-103-7935, 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 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-103-7935 |
| Primary Part Number | 78351-428 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.458 INCHES MAXIMUM IN |
| Width Across Flats | 0.304 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS2401 ASSN STD ALL TREATMENT RESPONSES OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT MAXIMUM DEGF |
| Washer Thickness | 0.050 INCHES NOMINAL IN |
| Material Document and Classification | AMS6304 ASSN STD 1ST MATERIAL RESPONSE OR AMS6487 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 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 | 28 |
| Material | STEEL OR STEEL COMP H11 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 |
|---|---|
| 78351-428 | The Boeing Company Div Defense (USA) |
| 78351-428 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| H50675-4 PRIMARY | Howmet Global Fastening Systems Inc. Div Microdot Products (USA) |
| H50675-4 | Satair A/s (DNK) |
| H50675-4 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M737-4 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| LH12343-4 | 5/9 Secondary reference Harvard Industries Inc |
NSN 5310-01-103-7935 is a Nut,self-Locking,extended Washer, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-103-7935 has 5 manufacturer part numbers on file: 78351-428 (The Boeing Company Div Defense), 78351-428 (Sps Technologies, Llc Dba PB Fasteners), H50675-4 (Howmet Global Fastening Systems Inc. Div Microdot Products), H50675-4 (Satair A/s), H50675-4 (Howmet Global Fastening Systems Inc).
Key specifications for 78351-428: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.328 INCHES MAXIMUM IN; Washer Outside Diameter: 0.458 INCHES MAXIMUM IN; Width Across Flats: 0.304 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN. 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.