The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-00-989-5079, 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 13 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-989-5079 |
| Primary Part Number | 490278 |
| 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 | 0.433 INCHES MINIMUM AND 0.443 INCHES MAXIMUM IN |
| Width Across Flats | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Precious Material | SILVER |
| Washer Thickness | 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | SILVER OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY 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 |
|---|---|
| 490278 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 59854-428 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST1325-10 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 490278 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| B00101-4 | Bristol Industries, Llc (USA) |
| Reference | Meaning |
|---|---|
| ST1180-10 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 490278 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 4900278 | 3/9 Design control — primary reference Ssanford Tool & Design Inc |
| ST1180-10 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
NSN 5310-00-989-5079 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 5310-00-989-5079 has 5 manufacturer part numbers on file: 490278 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 59854-428 (Sps Technologies, Llc Dba PB Fasteners), ST1325-10 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 490278 (Sps Technologies, Llc Dba PB Fasteners), B00101-4 (Bristol Industries, Llc).
Key specifications for 490278: Overall Height: 0.396 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN; Washer Outside Diameter: 0.433 INCHES MINIMUM AND 0.443 INCHES MAXIMUM IN; Width Across Flats: 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF). 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.