The Nut,tube Coupling, cataloged under National Stock Number 4730-01-044-3811, 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17 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-044-3811 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 0.603 INCHES NOMINAL IN |
| Width Across Flats | 0.688 INCHES NOMINAL IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Configuration Style | CONFIGURATION B |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.562 INCHES IN |
| Specification/standard Data | 81349-MIL-F-5509 GOVERNMENT SPECIFICATION |
| Nut Height | 0.724 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.046 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 18 |
| Material | STEEL COMP 316 OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.440 INCHES MINIMUM AND 0.443 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.375 INCHES IN |
| Hole Type and Quantity | 4 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 |
|---|---|
| AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
| AN818-L6K | 2/2 Government specification standardization U.S. Government activity |
| AN818L6J | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| SAE-AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
| MIL-F-5509 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-044-3811 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-01-119-6791. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-044-3811: Length to Shoulder: 0.603 INCHES NOMINAL IN; Width Across Flats: 0.688 INCHES NOMINAL IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); 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.