The Coupling Assembly,tube,flexible, cataloged under National Stock Number 4730-01-283-3937, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Hydraflow. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-283-3937 |
| Primary Part Number | 12J71-40C |
| Item Name | Coupling Assembly,tube,flexible |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Hydraflow |
| Status | ACTIVE |
| Tube Outside Diameter for Which Designed | 2.250 INCHES NOMINAL IN |
| Style Designator | FLEXIBLE COUPLING ASSEMBLY |
| Outside Diameter | 3.380 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| W701-40C | Transdigm Inc Div Adelwiggins Group (USA) |
| ST7M174-40C | The Boeing Company Div Defense (USA) |
| 12J71-40C PRIMARY | Hydraflow (USA) |
| Reference | Meaning |
|---|---|
| ST7M174 | D/9 Drawing number reference only The Boeing Company Div Defense |
NSN 4730-01-283-3937 is a Coupling Assembly,tube,flexible, manufactured by Hydraflow, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-283-3937 has 3 manufacturer part numbers on file: W701-40C (Transdigm Inc Div Adelwiggins Group), ST7M174-40C (The Boeing Company Div Defense), 12J71-40C (Hydraflow).
Key specifications for 12J71-40C: Tube Outside Diameter for Which Designed: 2.250 INCHES NOMINAL IN; Style Designator: FLEXIBLE COUPLING ASSEMBLY; Overall Length: 1.504 INCHES NOMINAL IN; Outside Diameter: 3.380 INCHES NOMINAL IN. 4 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.