The Nut,tube Coupling, cataloged under National Stock Number 4730-01-654-2630, 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 10 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-654-2630 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 0.406 INCHES NOMINAL IN |
| Width Across Flats | 0.559 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.4375 INCHES IN |
| Nut Height | 0.615 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Smallest Inside Diameter | 0.305 INCHES MINIMUM AND 0.308 INCHES MAXIMUM 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 |
|---|---|
| AN818 | 5/9 Secondary reference U.S. Government activity |
| SAE-AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
| AN818-4R | 2/2 Government specification standardization U.S. Government activity |
NSN 4730-01-654-2630 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-654-2630: Length to Shoulder: 0.406 INCHES NOMINAL IN; Width Across Flats: 0.559 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Thread Direction: RIGHT-HAND. 10 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.