The Coupling Assembly,tube,flexible, cataloged under National Stock Number 4730-01-173-4735, 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 Transdigm Inc Div Adelwiggins Group. Government technical data includes 6 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-173-4735 |
| Primary Part Number | W991-10DE |
| Item Name | Coupling Assembly,tube,flexible |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Transdigm Inc Div Adelwiggins Group |
| Status | ACTIVE |
| Working Temp and Service Type | 450.0 DEG FAHRENHEIT NOMINAL AIR |
| Tube Outside Diameter for Which Designed | 0.625 INCHES NOMINAL IN |
| Style Designator | FLEXIBLE COUPLING ASSEMBLY |
| Outside Diameter | 1.113 INCHES MINIMUM AND 1.350 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY 6061 |
| Working Pressure and Service Type | 500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM AIR LBS |
| 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 |
|---|---|
| W991-10DE PRIMARY | Transdigm Inc Div Adelwiggins Group (USA) |
| 23DNFTCA4735 PRIMARY | Parts Life Inc (USA) |
| 14J02-10A | Hydraflow (USA) |
| Reference | Meaning |
|---|---|
| W901A10DE | C/1 Advisory reference — outside the item-of-supply concept Transdigm Inc Div Adelwiggins Group |
| C7551B1-10 | 7/2 Vendor item drawing reference U.S. Government activity |
| C7551-1-10 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 7681-66924-001 | C/1 Advisory reference — outside the item-of-supply concept Hughes Missile Systems Co San Diego |
| 4730PL0735829 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| C7551 | D/9 Drawing number reference only U.S. Government activity |
| W901B10DE | C/1 Advisory reference — outside the item-of-supply concept Transdigm Inc Div Adelwiggins Group |
| 4730PL1757076 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| W901J10DE | 5/9 Secondary reference Transdigm Inc Div Adelwiggins Group |
NSN 4730-01-173-4735 is a Coupling Assembly,tube,flexible, manufactured by Transdigm Inc Div Adelwiggins Group, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-173-4735 has 3 manufacturer part numbers on file: W991-10DE (Transdigm Inc Div Adelwiggins Group), 23DNFTCA4735 (Parts Life Inc), 14J02-10A (Hydraflow).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-174-3858. Verify interchangeability with system specifications before substitution.
Key specifications for W991-10DE: Working Temp and Service Type: 450.0 DEG FAHRENHEIT NOMINAL AIR; Tube Outside Diameter for Which Designed: 0.625 INCHES NOMINAL IN; Style Designator: FLEXIBLE COUPLING ASSEMBLY; Overall Length: 1.380 INCHES NOMINAL IN. 6 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.