The Restrictor Unit,fluid Flow, cataloged under National Stock Number 4730-00-957-5247, 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 Marvin Engineering Co, Inc. Government technical data includes 25 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-00-957-5247 |
| Primary Part Number | R4001-3 |
| Item Name | Restrictor Unit,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Marvin Engineering Co, Inc |
| Status | ACTIVE |
| Flow Rate and Fluid Type | 2.1 GALLONS PER MINUTE OIL |
| Pressure Rating | 3000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Width Across Flats | 0.910 INCHES NOMINAL IN |
| Strainer Type and Quantity | 2 FILTER |
| End Connection Component Type and Size for Which Designed | 1/4 IN. OD TUBE AND 3/8 IN. OD TUBE IN |
| Design Type | STRAIGHT |
| Thread Series | UNF OR NF FIRST CONNECTION |
| Thread Series | UNF OR NF SECOND CONNECTION |
| End Connection Type | THREADED MALE, COMPRESSION FIRST CONNECTION |
| End Connection Type | THREADED MALE, COMPRESSION SECOND CONNECTION |
| Valve Size | 0.813 INCHES IN |
| Thread Direction | RIGHT-HAND SECOND CONNECTION |
| Thread Direction | RIGHT-HAND FIRST CONNECTION |
| Thread Size Designator | 7/16 -20 FIRST CONNECTION |
| Thread Size Designator | 9/16 -18 SECOND CONNECTION |
| Operating Temp Range | -65.0 TO 275.0 FAHRENHEIT DEGF |
| Thread Class | 3A OR 3 FIRST CONNECTION A |
| Thread Class | 3A OR 3 SECOND CONNECTION A |
| Material | STEEL CORROSION RESISTING FILTER |
| Material | ALUMINUM ALLOY BODY |
| Material | WOOL PACKING |
| Orifice Diameter | 0.050 INCHES NOMINAL IN |
| End Connection Similarity | IDENTICAL |
| Compression Type | DOUBLE COMPRESSION FIRST CONNECTION |
| Compression Type | DOUBLE COMPRESSION SECOND CONNECTION |
| 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 |
|---|---|
| R4001-3 | Marvin Engineering Co, Inc (USA) |
| Reference | Meaning |
|---|---|
| R4001-3 | 3/9 Design control — primary reference Engineered Magnetics Inc Aap Div |
NSN 4730-00-957-5247 is a Restrictor Unit,fluid Flow, manufactured by Marvin Engineering Co, Inc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-957-5247 has 1 manufacturer part number on file: R4001-3 (Marvin Engineering Co, Inc).
Key specifications for R4001-3: Flow Rate and Fluid Type: 2.1 GALLONS PER MINUTE OIL; Pressure Rating: 3000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Width Across Flats: 0.910 INCHES NOMINAL IN; Strainer Type and Quantity: 2 FILTER. 25 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.