The Nut,tube Coupling, cataloged under National Stock Number 4730-00-287-0294, 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 16 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-287-0294 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 0.460 INCHES NOMINAL IN |
| Width Across Flats | 0.371 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNF |
| Material Document and Classification | QQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Nut Height | 0.531 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 1137 OR STEEL COMP 1141 OVERALL |
| Fabrication Method | MACHINED OR FORGED |
| Smallest Inside Diameter | 0.180 INCHES MINIMUM AND 0.183 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.125 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 |
|---|---|
| AS4841 | 5/9 Secondary reference U.S. Government activity |
| AN818-2 | 2/2 Government specification standardization U.S. Government activity |
| SAE-AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
| MIL-F-5509A | 5/9 Secondary reference U.S. Government activity |
| AN818-2 | 5/9 Secondary reference Tech Aero Inc |
| AS4841 | 5/1 Secondary reference Sae International Dba Sae International |
NSN 4730-00-287-0294 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-287-0294: Length to Shoulder: 0.460 INCHES NOMINAL IN; Width Across Flats: 0.371 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNF. 16 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.