The Restrictor,fluid Flow, cataloged under National Stock Number 4730-01-337-7609, 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 Triumph Thermal Systems, Llc. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-337-7609 |
| Primary Part Number | UA538951-259 |
| Item Name | Restrictor,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Triumph Thermal Systems, Llc |
| Status | ACTIVE |
| Length | 1.188 INCHES NOMINAL IN |
| Thread Provision | THREADED ALL PROVISIONS |
| Design Type | TUBULAR, HEX SHAPE |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST PROVISION |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) SECOND PROVISION |
| Thread Length | 0.469 INCHES NOMINAL FIRST PROVISION IN |
| Thread Length | 0.469 INCHES NOMINAL SECOND PROVISION IN |
| Hose/tube Size for Which Designed | 3/8 IN. OD TUBE IN |
| Thread Direction | RIGHT-HAND FIRST PROVISION |
| Thread Direction | RIGHT-HAND SECOND PROVISION |
| Thread Size Designator | 9/16-18 SECOND PROVISION |
| Thread Size Designator | 9/16-18 FIRST PROVISION |
| Surface Treatment | ANODIZE |
| Thread Class | 3A SECOND PROVISION A |
| Thread Class | 3A FIRST PROVISION A |
| Material | ALUMINUM ALLOY 6061 |
| Orifice Diameter | 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN |
| 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 |
|---|---|
| UA538951-259 PRIMARY | Triumph Thermal Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| UA538951 | D/9 Drawing number reference only Triumph Thermal Systems, Llc |
NSN 4730-01-337-7609 is a Restrictor,fluid Flow, manufactured by Triumph Thermal Systems, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-337-7609 has 1 manufacturer part number on file: UA538951-259 (Triumph Thermal Systems, Llc).
Key specifications for UA538951-259: Length: 1.188 INCHES NOMINAL IN; Thread Provision: THREADED ALL PROVISIONS; Design Type: TUBULAR, HEX SHAPE; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF) FIRST PROVISION. 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.