The Restrictor Unit,fluid Flow, cataloged under National Stock Number 4730-01-368-1563, 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 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-368-1563 |
| Primary Part Number | UA540159-313 |
| Item Name | Restrictor Unit,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Triumph Thermal Systems, Llc |
| Status | ACTIVE |
| Design Type | STRAIGHT |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) SECOND CONNECTION |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) THIRD CONNECTION |
| End Connection Type | THREADED MALE, FLARELESS TUBE SECOND CONNECTION |
| End Connection Type | THREADED MALE, FLARELESS TUBE THIRD CONNECTION |
| Diameter | 0.174 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND THIRD CONNECTION |
| Thread Direction | RIGHT-HAND SECOND CONNECTION |
| Thread Size Designator | 7/16-20 SECOND CONNECTION |
| Thread Size Designator | 7/16-20 THIRD CONNECTION |
| Thread Class | 3A SECOND CONNECTION A |
| Thread Class | 3A THIRD CONNECTION A |
| Material | ALUMINUM ALLOY BODY |
| Orifice Diameter | 0.046 INCHES NOMINAL IN |
| End Connection Similarity | IDENTICAL |
| 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 |
|---|---|
| UA540159-313 PRIMARY | Triumph Thermal Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| UA540159 | D/9 Drawing number reference only Triumph Thermal Systems, Llc |
NSN 4730-01-368-1563 is a Restrictor Unit,fluid Flow, manufactured by Triumph Thermal Systems, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-368-1563 has 1 manufacturer part number on file: UA540159-313 (Triumph Thermal Systems, Llc).
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-368-1564, 4730-01-368-1565, 4730-01-434-4873. Verify interchangeability with system specifications before substitution.
Key specifications for UA540159-313: Design Type: STRAIGHT; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF) SECOND CONNECTION; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF) THIRD CONNECTION; End Connection Type: THREADED MALE, FLARELESS TUBE SECOND CONNECTION. 15 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.