The Restrictor Unit,fluid Flow, cataloged under National Stock Number 4730-01-446-8556, 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14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-446-8556 |
| Item Name | Restrictor Unit,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Strainer Type and Quantity | 1 SCREEN |
| Design Type | STRAIGHT |
| Thread Series | UNF SECOND CONNECTION |
| End Connection Type | FLARE TUBE SECOND CONNECTION |
| End Connection Type | THREADED FEMALE THIRD CONNECTION |
| Valve Size | 0.005 INCHES IN |
| Thread Direction | RIGHT-HAND SECOND CONNECTION |
| Thread Size Designator | 0.250-28 SECOND CONNECTION |
| Thread Class | 3B SECOND CONNECTION |
| Unable to Decode | UNABLE TO DECODE |
| Material | STEEL CORROSION RESISTING SCREENING |
| Material | STEEL CORROSION RESISTING BODY |
| End Connection Similarity | NOT IDENTICAL |
| Angle Between Connections | 45.0 DEGREES NOMINAL 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 |
| Reference | Meaning |
|---|---|
| VDCA4310950K | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-446-8556 is a Restrictor Unit,fluid Flow, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-446-8556: Strainer Type and Quantity: 1 SCREEN; Design Type: STRAIGHT; Thread Series: UNF SECOND CONNECTION; End Connection Type: FLARE TUBE SECOND CONNECTION. 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.