The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-495-1397, 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 6 specifications, cited from the U.S. Government catalog. The record lists 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-495-1397 |
| Primary Part Number | ST2590-09 |
| 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 |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.190 INCHES IN |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| 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 |
|---|---|
| ST2595-09 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| IC ST2590-09 | Howmet Global Fastening Systems Inc (USA) |
| ST2590-09 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST2591-09 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST2594-09 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST2593-09 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST2592-09 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| IC ST2590-09 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| IC ST2590-09 | Bristol Industries, Llc (USA) |
| Reference | Meaning |
|---|---|
| 5310PL0754423 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| IC ST2590-09 | 5/9 Secondary reference Bacon Crane and Hoist Corp |
| IC ST2590-09 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-495-1397 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 5310-01-495-1397 has 9 manufacturer part numbers on file: ST2595-09 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), IC ST2590-09 (Howmet Global Fastening Systems Inc), ST2590-09 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST2591-09 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST2594-09 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney) and 4 more.
Key specifications for ST2590-09: Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.190 INCHES IN; Nut Style: DOUBLE HEXAGON. 6 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.