The Reducer,tube, cataloged under National Stock Number 4730-01-411-7539, 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 Dynaflex Products. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4730-01-411-7539 |
| Primary Part Number | 97-4540 |
| Item Name | Reducer,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Dynaflex Products |
| Status | ACTIVE |
| Flange Shape | ROUND SECOND END |
| Flange Face Design | PLAIN SECOND END |
| Connection Style | PLAIN (TUBE) FIRST END |
| Connection Style | SHOULDERED (GASKET) (TUBE) SECOND END |
| Nominal Overall Length | 1.750 INCHES IN |
| Connection Type | FLANGE SECOND END |
| Connection Type | UNTHREADED INTERNAL TUBE FIRST END |
| Nominal Outside Diameter Tube Accommodated | 4.000 INCHES FIRST END IN |
| Nominal Outside Diameter Tube Accommodated | 4.500 INCHES SECOND END IN |
| Material | STEEL CORROSION RESISTING SLEEVE |
| Reducer Type | CONCENTRIC |
| 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 |
|---|---|
| 97-4540 PRIMARY | Dynaflex Products (USA) |
NSN 4730-01-411-7539 is a Reducer,tube, manufactured by Dynaflex Products, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-411-7539 has 1 manufacturer part number on file: 97-4540 (Dynaflex Products).
1 possible match (shared part number, not a government interchangeability claim): 1650-01-542-9724. Verify interchangeability with system specifications before substitution.
Key specifications for 97-4540: Flange Shape: ROUND SECOND END; Flange Face Design: PLAIN SECOND END; Connection Style: PLAIN (TUBE) FIRST END; Connection Style: SHOULDERED (GASKET) (TUBE) SECOND END. 11 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.