The Reducer,tube, cataloged under National Stock Number 4730-01-015-5878, 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 Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-015-5878 |
| Primary Part Number | 4RU1-316 |
| Item Name | Reducer,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok |
| Status | ACTIVE |
| Connection Style | FLARELESS (TUBE) ALL ENDS |
| Nominal Overall Length | 1.375 INCHES IN |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST END IN |
| Nominal Outside Diameter Tube Accommodated | 0.062 INCHES SECOND END IN |
| Nominal Thread Size | 0.190 INCHES SECOND END IN |
| Nominal Thread Size | 0.438 INCHES FIRST END IN |
| Seat Angle | 20.0 DEGREES ALL ENDS |
| Surface Treatment | PASSIVATE OUTSIDE |
| Media for Which Designed | HYDRAULIC FLUID SINGLE RESPONSE |
| Thread Class | 3A ALL ENDS A |
| Material | STEEL COMP 316 OVERALL |
| Thread Series Designator | UNF ALL ENDS |
| Reducer Type | CONCENTRIC |
| 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 |
|---|---|
| 4-1HBZ-SS | Parker-Hannifin Corporation Div Instrumentation Products Division (USA) |
| 4RU1-316 PRIMARY | Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (USA) |
| Reference | Meaning |
|---|---|
| 400-6-1-316 | 5/9 Secondary reference Swagelok Co Dba Use CAGE Code 3t9t9 for Cataloging |
| SS-400-6-1 | 5/9 Secondary reference Swagelok Co Dba Use CAGE Code 3t9t9 for Cataloging |
NSN 4730-01-015-5878 is a Reducer,tube, manufactured by Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-015-5878 has 2 manufacturer part numbers on file: 4-1HBZ-SS (Parker-Hannifin Corporation Div Instrumentation Products Division), 4RU1-316 (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-112-1290. Verify interchangeability with system specifications before substitution.
Key specifications for 4RU1-316: Connection Style: FLARELESS (TUBE) ALL ENDS; Nominal Overall Length: 1.375 INCHES IN; Connection Type: THREADED EXTERNAL TUBE ALL ENDS; Material Document and Classification: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL. 15 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.