The Inverted Nut,tube Coupling, cataloged under National Stock Number 4730-01-260-8069, 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 17 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-01-260-8069 |
| Item Name | Inverted Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 0.863 INCHES MINIMUM AND 0.887 INCHES MAXIMUM IN |
| Seat Angle in Deg | 33.0 |
| Strength Rating | ERR-060 |
| Tube Outside Diameter for Which Designed | 0.500 INCHES NOMINAL IN |
| Application/function | U/O H TEMP,HP PNEUMATIC AND HYD SYS,FUEL SYS,AND CYROGENIC SYS |
| Style Designator | INVERTED NUT, TUBE, FLARE |
| Material Document and Classification | QQ-A-225/6, ALLOY 2024, T851 FED SPEC SINGLE MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS591 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 0.750-16 |
| Screw Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Surface Treatment | ANODIZE |
| Thread Class | 3A A |
| Material | ALUMINUM ALLOY 2024 |
| Fabrication Method | COLD DRAWN OR ROLLED |
| Smallest Inside Diameter | 0.505 INCHES MINIMUM AND 0.508 INCHES MAXIMUM 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 |
|---|---|
| NAS591-8H | 5/9 Secondary reference Crown Fitting Co Inc |
| 4177-8H | C/1 Advisory reference — outside the item-of-supply concept Rubbercraft Corporation of California, Ltd. Dba Rubbercraft Corp |
| NAS591-8H | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-260-8069 is a Inverted Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-260-8069: Width Across Flats: 0.863 INCHES MINIMUM AND 0.887 INCHES MAXIMUM IN; Seat Angle in Deg: 33.0; Strength Rating: ERR-060; Tube Outside Diameter for Which Designed: 0.500 INCHES NOMINAL IN. 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.