The Nut,tube Coupling, cataloged under National Stock Number 4730-00-720-1798, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-720-1798 |
| Primary Part Number | PA921-3CG |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn |
| Status | ACTIVE |
| Length to Shoulder | 0.429 INCHES NOMINAL IN |
| Width Across Flats | 0.438 INCHES NOMINAL IN |
| Thread Series | UNF |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Nut Height | 0.580 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Smallest Inside Diameter | 0.232 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.188 INCHES IN |
| 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 |
|---|---|
| PA921-3CG PRIMARY | Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn (USA) |
| Reference | Meaning |
|---|---|
| PA921-3CG | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-720-1798 is a Nut,tube Coupling, manufactured by Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-720-1798 has 1 manufacturer part number on file: PA921-3CG (Parker Hannifin Corp Stratoflex Div Aircraft Fittings Opn).
Key specifications for PA921-3CG: Length to Shoulder: 0.429 INCHES NOMINAL IN; Width Across Flats: 0.438 INCHES NOMINAL IN; Thread Series: UNF; Seat Angle: 45.00 DEGREES NOMINAL. 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.