The Nut,tube Coupling, cataloged under National Stock Number 4730-00-775-9739, 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 Superior Valve Co. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-775-9739 |
| Primary Part Number | NSR4-86 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Superior Valve Co |
| Status | ACTIVE |
| Length to Shoulder | 0.563 INCHES NOMINAL IN |
| Width Across Flats | 1.000 INCHES NOMINAL IN |
| Thread Series | UNF |
| Seat Angle | 37.0 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.750 INCHES IN |
| Nut Height | 0.844 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 16 |
| Material | COPPER OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.375 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.500 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 |
NSN 4730-00-775-9739 is a Nut,tube Coupling, manufactured by Superior Valve Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-775-9739 has 2 manufacturer part numbers on file: NSR4-86 (Superior Valve Co), A5141 (Mueller Brass Co.).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-588-6169. Verify interchangeability with system specifications before substitution.
Key specifications for NSR4-86: Length to Shoulder: 0.563 INCHES NOMINAL IN; Width Across Flats: 1.000 INCHES NOMINAL IN; Thread Series: UNF; Seat Angle: 37.0 DEGREES NOMINAL. 14 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.