The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-320-7364, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-320-7364 |
| Primary Part Number | ST2590-10 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Washer Outside Diameter | 0.410 INCHES MINIMUM IN |
| Width Across Flats | 0.312 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE THREADS |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Precious Material | SILVER |
| Hardness Rating | 34.0 ROCKWELL C MINIMUM |
| Washer Thickness | 0.045 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5709 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH METALLIC INSERT |
| Surface Treatment | SILVER THREADS |
| Precious Material and Location | ON THREADS SILVER |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY UNS N07001 OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| ST2595-10 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST2593-10 | Howmet Global Fastening Systems Inc (USA) |
| ST2593-10 | Bristol Industries, Llc (USA) |
| ST2590-10 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST2594-10 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST2593-10 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| ST2593-10 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| ST2591-10 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| H53831-4 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| 4075146 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| 5310PL0754330 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 92752-428 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| VN4762WA048 | 5/9 Secondary reference U.S. Government activity |
| ST2592-10 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| LH13291-4 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BH00470-4 | 5/9 Secondary reference Bristol Industries, Llc |
| 5310PL0754326 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5310-01-320-7364 is a Nut,self-Locking,extended Washer, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-320-7364 has 6 manufacturer part numbers on file: ST2595-10 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST2593-10 (Howmet Global Fastening Systems Inc), ST2593-10 (Bristol Industries, Llc), ST2590-10 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST2594-10 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney) and 1 more.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-322-7557. Verify interchangeability with system specifications before substitution.
Key specifications for ST2590-10: Overall Height: 0.308 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN; Washer Outside Diameter: 0.410 INCHES MINIMUM IN; Width Across Flats: 0.312 INCHES NOMINAL IN; Surface Treatment Document and Classification: AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE THREADS. 17 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.