The Nut,union, cataloged under National Stock Number 4730-01-259-5773, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-259-5773 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 0.9375 INCHES NOMINAL IN |
| Thread Series | UN |
| Maximum Working Pressure Rating and Service for Which Designed | 6000.0 POUNDS PER SQUARE INCH (PSI) OIL LBS |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.813 INCHES IN |
| Nut Height | 0.500 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Smallest Inside Diameter | 0.500 INCHES NOMINAL IN |
| Shoulder Seat Diameter | 0.8125 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| H850N-8SS | 5/9 Secondary reference U.S. Government activity |
| H850N-08-SS | 3/2 Design control — primary reference U.S. Government activity |
| NV1021974 FIND NO 4 | C/1 Advisory reference — outside the item-of-supply concept Hamilton Sundstrand Corporation Dba Collins Aerospace |
NSN 4730-01-259-5773 is a Nut,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-259-5773: Width Across Flats: 0.9375 INCHES NOMINAL IN; Thread Series: UN; Maximum Working Pressure Rating and Service for Which Designed: 6000.0 POUNDS PER SQUARE INCH (PSI) OIL LBS; Thread Direction: RIGHT-HAND. 12 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.