The Nut,tube Coupling, cataloged under National Stock Number 4730-01-190-5791, 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 13 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-190-5791 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 0.904 INCHES MINIMUM AND 0.924 INCHES MAXIMUM IN |
| Width Across Flats | 1.375 INCHES NOMINAL IN |
| Thread Series | UN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.188 INCHES IN |
| Specification/standard Data | 96906-MS51531 GOVERNMENT STANDARD AND 81349-MIL-F-18866 GOVERNMENT SPECIFICATION |
| Nut Height | 1.070 INCHES MINIMUM AND 1.090 INCHES MAXIMUM IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Smallest Inside Diameter | 0.961 INCHES MINIMUM AND 0.964 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.875 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 |
|---|---|
| 14BTX-SS | 5/1 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division |
| MS51531B14S | 2/2 Government specification standardization U.S. Government activity |
| MIL-DTL-18866 | 4/1 Identification reference U.S. Government activity |
| 14BTX-SS | 5/9 Secondary reference U.S. Government activity |
| MS51531A14S | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-190-5791 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-190-5791: Length to Shoulder: 0.904 INCHES MINIMUM AND 0.924 INCHES MAXIMUM IN; Width Across Flats: 1.375 INCHES NOMINAL IN; Thread Series: UN; Thread Direction: RIGHT-HAND. 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.