The Restrictor Unit,fluid Flow, cataloged under National Stock Number 4730-01-170-2438, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-01-170-2438 |
| Primary Part Number | SS49MC902J4-25R |
| 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 | 0.500 INCHES NOMINAL IN |
| Strainer Type and Quantity | 1 FILTER |
| 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, FLARELESS TUBE ALL CONNECTIONS |
| Material Document and Classification | FED STD 66, AISI 304L/SAE 30304 FED STD SINGLE MATERIAL RESPONSE BODY |
| Thread Direction | RIGHT-HAND ALL CONNECTIONS |
| Thread Size Designator | 7/16-20 ALL CONNECTIONS |
| Thread Class | 3A ALL CONNECTIONS A |
| Material | STEEL COMP 304 BODY |
| Material | STEEL CORROSION RESISTING FILTER |
| Orifice Diameter | 0.010 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 |
|---|---|
| SS49MC902J4-25R PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| Reference | Meaning |
|---|---|
| SS49 | D/9 Drawing number reference only Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| JSFA25900204JR | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-170-2438 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 4730-01-170-2438 has 1 manufacturer part number on file: SS49MC902J4-25R (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for SS49MC902J4-25R: Width Across Flats: 0.500 INCHES NOMINAL IN; Strainer Type and Quantity: 1 FILTER; 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.