The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-135-2425, 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 14 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-135-2425 |
| Primary Part Number | H51533-532 |
| 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 | 0.520 INCHES MAXIMUM IN |
| Width Across Flats | 0.368 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN |
| Thread Series | UNJEF |
| Temp Rating | 450.0 FAHRENHEIT MAXIMUM DEGF |
| Washer Thickness | 0.023 INCHES MINIMUM IN |
| Material Document and Classification | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 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 |
|---|---|
| H51533-532 | Howmet Global Fastening Systems Inc (USA) |
| H51533-532 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M947-5 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 10109720 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| H51533-532 | 5/9 Secondary reference U.S. Government activity |
| 3929AS1221-5 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
NSN 5310-01-135-2425 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 5310-01-135-2425 has 3 manufacturer part numbers on file: H51533-532 (Howmet Global Fastening Systems Inc), H51533-532 (Sps Technologies, Llc Dba PB Fasteners), 3M947-5 (The Boeing Company Div Defense).
Key specifications for H51533-532: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.251 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN; Washer Outside Diameter: 0.520 INCHES MAXIMUM IN; Width Across Flats: 0.368 INCHES MINIMUM AND 0.378 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.