The Restrictor Unit,fluid Flow, cataloged under National Stock Number 4730-00-933-1990, 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 Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-933-1990 |
| Primary Part Number | SS49MC902J4-19R |
| Item Name | Restrictor Unit,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Width Across Flats | 0.688 INCHES NOMINAL IN |
| Strainer Type and Quantity | 1 SCREEN |
| End Connection Component Type and Size for Which Designed | 1/4 IN. TUBE SIZE IN |
| Design Type | STRAIGHT |
| Thread Series | UNF ALL CONNECTIONS |
| End Connection Type | THREADED MALE, FLARELESS TUBE ALL CONNECTIONS |
| Valve Size | 0.437 INCHES IN |
| Thread Direction | RIGHT-HAND ALL CONNECTIONS |
| Thread Size Designator | T/16-20 ALL CONNECTIONS |
| Thread Class | 2A ALL CONNECTIONS A |
| Material | STEEL CORROSION RESISTING SCREENING |
| Material | STEEL CORROSION RESISTING BODY |
| Orifice Diameter | 0.109 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 |
|---|---|
| SS49MC902J4-19R PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| Reference | Meaning |
|---|---|
| SS49MC902-4J19R | 5/9 Secondary reference Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| SS49MC902-4C19R | 5/9 Secondary reference Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
NSN 4730-00-933-1990 is a Restrictor Unit,fluid Flow, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-933-1990 has 1 manufacturer part number on file: SS49MC902J4-19R (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for SS49MC902J4-19R: Width Across Flats: 0.688 INCHES NOMINAL IN; Strainer Type and Quantity: 1 SCREEN; End Connection Component Type and Size for Which Designed: 1/4 IN. TUBE SIZE 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.