The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-078-9435, 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 20 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-078-9435 |
| Primary Part Number | 77658-524 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Washer Outside Diameter | 0.491 INCHES MINIMUM AND 0.532 INCHES MAXIMUM IN |
| Width Across Flats | 0.267 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS2410 ASSN STD SINGLE TREATMENT RESPONSE THREADS |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT THREADS |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Precious Material | SILVER |
| Temp Rating | 600.0 FAHRENHEIT MAXIMUM DEGF |
| Hardness Rating | 48.0 ROCKWELL C MAXIMUM |
| Washer Thickness | 0.035 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 | 0.312 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | SILVER THREADS |
| Surface Treatment | PASSIVATE OVERALL EXCEPT THREADS |
| Precious Material and Location | THREADS SILVER |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| 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 |
|---|---|
| 77658-524 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| H50737-5 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| H50737-4 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| 642AS0736-4 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| 77658-524 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-078-9435 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 5310-01-078-9435 has 2 manufacturer part numbers on file: 77658-524 (Sps Technologies, Llc Dba PB Fasteners), H50737-5 (Howmet Global Fastening Systems Inc).
Key specifications for 77658-524: Overall Height: 0.363 INCHES MAXIMUM IN; Washer Outside Diameter: 0.491 INCHES MINIMUM AND 0.532 INCHES MAXIMUM IN; Width Across Flats: 0.267 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS2410 ASSN STD SINGLE TREATMENT RESPONSE THREADS. 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.