The Nut,tube Coupling, cataloged under National Stock Number 4730-01-063-4373, 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 17 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-01-063-4373 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 0.820 INCHES NOMINAL IN |
| Width Across Flats | 2.250 INCHES NOMINAL IN |
| Thread Series | UN |
| Hole Configuration Style | CONFIGURATION B |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.875 INCHES IN |
| Nut Height | 1.000 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.043 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 16 |
| Material | COPPER ALLOY 464 OVERALL |
| Fabrication Method | FORGED |
| Smallest Inside Diameter | 1.191 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 1.500 INCHES IN |
| Reference Number Differentiating Characteristics | FREE OF MERCURY CONTAMINATION,FOR USE IN NUCLEAR PROPULSION PLANT |
| Hole Type and Quantity | 2 DRILLED |
| 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 |
|---|---|
| 10221 | 3/9 Design control — primary reference Peerless Nuclear Corp |
NSN 4730-01-063-4373 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-063-4373: Length to Shoulder: 0.820 INCHES NOMINAL IN; Width Across Flats: 2.250 INCHES NOMINAL IN; Thread Series: UN; Hole Configuration Style: CONFIGURATION B. 17 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.