The Inverted Nut,tube Coupling, cataloged under National Stock Number 4730-00-983-7572, 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 13 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-00-983-7572 |
| Item Name | Inverted Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 2.750 INCHES NOMINAL IN |
| Seat Angle in Deg | 33.0 |
| Tube Outside Diameter for Which Designed | 2.000 INCHES NOMINAL IN |
| Style Designator | INVERTED NUT, TUBE, FLARE |
| Material Document and Classification | QQ-A-225/6, ALLOY 2024, T6 FED SPEC SINGLE MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 2-1/2-12 |
| Screw Thread Series Designator | UN |
| Surface Treatment | ANODIZE |
| Thread Class | 3A A |
| Material | ALUMINUM ALLOY 2024 |
| Smallest Inside Diameter | 2.014 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 |
|---|---|
| NAS591-32 | 3/1 Design control — primary reference Aerofit, Llc |
| NAS 597 | 3/1 Design control — primary reference U.S. Government activity |
| NAS591-32 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-983-7572 is a Inverted Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-983-7572: Width Across Flats: 2.750 INCHES NOMINAL IN; Seat Angle in Deg: 33.0; Tube Outside Diameter for Which Designed: 2.000 INCHES NOMINAL IN; Style Designator: INVERTED NUT, TUBE, FLARE. 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.