The Nut,tube Coupling,reducing, cataloged under National Stock Number 4730-00-203-3435, 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 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-203-3435 |
| Item Name | Nut,tube Coupling,reducing |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 2.500 INCHES NOMINAL IN |
| Width Across Flats | 2.641 INCHES NOMINAL IN |
| Largest Outside Diameter | 3.375 INCHES NOMINAL IN |
| Thread Series | UNF |
| Seat Angle | 41.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 3.000 INCHES IN |
| Nut Height | 3.000 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 1B |
| Thread Quantity Per Inch | 12 |
| Material | ALUMINUM ALLOY OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 2.563 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 2.500 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 |
| Reference | Meaning |
|---|---|
| RE66F499P10ALTF | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-203-3435 is a Nut,tube Coupling,reducing, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-203-3435: Length to Shoulder: 2.500 INCHES NOMINAL IN; Width Across Flats: 2.641 INCHES NOMINAL IN; Largest Outside Diameter: 3.375 INCHES NOMINAL IN; Thread Series: UNF. 16 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.