The Nut,tube Coupling,reducing, cataloged under National Stock Number 4730-00-203-3280, 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12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-203-3280 |
| Item Name | Nut,tube Coupling,reducing |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 0.620 INCHES NOMINAL IN |
| Thread Series | UNF |
| Material Document and Classification | AISI NO. B113 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Nominal Thread Size | 0.500 INCHES IN |
| Nut Height | 0.880 INCHES NOMINAL IN |
| Surface Treatment | ZINC OVERALL |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Smallest Inside Diameter | 0.317 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.313 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 |
|---|---|
| 101-13505 | 3/9 Design control — primary reference Dana Corp Weatherhead Div |
| 101-13505 | C/1 Advisory reference — outside the item-of-supply concept Danfoss Power Solutions II, Llc |
NSN 4730-00-203-3280 is a Nut,tube Coupling,reducing, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-203-3280: Width Across Flats: 0.620 INCHES NOMINAL IN; Thread Series: UNF; Material Document and Classification: AISI NO. B113 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Seat Angle: 45.00 DEGREES NOMINAL. 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.