The Restrictor Unit,fluid Flow, cataloged under National Stock Number 4730-01-043-5394, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-043-5394 |
| Item Name | Restrictor Unit,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 0.688 INCHES NOMINAL IN |
| Strainer Type and Quantity | 2 SCREEN |
| End Connection Component Type and Size for Which Designed | 1/4 IN. OD TUBE IN |
| Design Type | STRAIGHT |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) ALL CONNECTIONS |
| End Connection Type | THREADED MALE TUBE ALL CONNECTIONS |
| Valve Size | 0.250 INCHES IN |
| Thread Direction | RIGHT-HAND ALL CONNECTIONS |
| Thread Size Designator | 7/16-20 ALL CONNECTIONS |
| Thread Class | 3A ALL CONNECTIONS A |
| Material | STEEL CORROSION RESISTING SCREENING |
| Material | STEEL CORROSION RESISTING BODY |
| Orifice Diameter | 0.005 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 |
| Reference | Meaning |
|---|---|
| A00144 | D/9 Drawing number reference only U.S. Government activity |
| VDLA 1815313K | 3/2 Design control — primary reference U.S. Government activity |
| A00144-001 | 5/9 Secondary reference The Boeing Company Div Defense |
| A00144-001 | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-043-5394 is a Restrictor Unit,fluid Flow, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-01-066-8196. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-043-5394: Width Across Flats: 0.688 INCHES NOMINAL IN; Strainer Type and Quantity: 2 SCREEN; End Connection Component Type and Size for Which Designed: 1/4 IN. OD TUBE IN; Design Type: STRAIGHT. 14 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.