The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-00-844-2239, 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 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-844-2239 |
| Primary Part Number | 387528 |
| 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 | 0.399 INCHES MINIMUM AND 0.409 INCHES MAXIMUM IN |
| Width Across Flats | 0.304 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Washer Thickness | 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | PLASTIC OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| 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 |
|---|---|
| 387528 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 387528 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 387528 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 387528 | 5/9 Secondary reference Now Corp Modern Mfg Div |
NSN 5310-00-844-2239 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 5310-00-844-2239 has 2 manufacturer part numbers on file: 387528 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 387528 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 387528: Overall Height: 0.282 INCHES MINIMUM AND 0.292 INCHES MAXIMUM IN; Washer Outside Diameter: 0.399 INCHES MINIMUM AND 0.409 INCHES MAXIMUM IN; Width Across Flats: 0.304 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN; Thread Series: UNF. 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.