The Coupling,tube, cataloged under National Stock Number 4730-01-337-7956, 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 25 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-337-7956 |
| Item Name | Coupling,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Connection Style | PLAIN (TUBE) SECOND END |
| Connection Style | GASKET SEAL (BOSS) INLET |
| Connection Style | PLAIN (TUBE) FIRST END |
| Nominal Overall Length | 2.690 INCHES IN |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Connection Type | THREADED INTERNAL TUBE FIRST END |
| Connection Type | THREADED INTERNAL BOSS INLET |
| Style Designator | RIGID, THREADED INTERNAL AND EXTERNAL |
| Material Document and Classification | QQ-C-390,ALLOY-D5,TYIII FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 3.000 INCHES SECOND END IN |
| Nominal Outside Diameter Tube Accommodated | 3.000 INCHES FIRST END IN |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Reduced Passage Nominal Inside Diameter | 2.181 INCHES SECOND END IN |
| Nominal Thread Size | 0.438 INCHES INLET IN |
| Nominal Thread Size | 3.500 INCHES FIRST END IN |
| Nominal Thread Size | 3.500 INCHES SECOND END IN |
| Thread Class | 2A SECOND END A |
| Thread Class | 2A FIRST END A |
| Thread Class | 2B INLET |
| Thread Quantity Per Inch | 12 FIRST END |
| Thread Quantity Per Inch | 10 SECOND END |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | UN FIRST END |
| Thread Series Designator | UNF INLET |
| Thread Series Designator | UNS SECOND END |
| 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 |
|---|---|
| 2621-561-02 PIECE 74 | 3/2 Design control — primary reference U.S. Government activity |
| 2621-561-02 | D/9 Drawing number reference only U.S. Government activity |
NSN 4730-01-337-7956 is a Coupling,tube, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-01-337-7956: Connection Style: PLAIN (TUBE) SECOND END; Connection Style: GASKET SEAL (BOSS) INLET; Connection Style: PLAIN (TUBE) FIRST END; Nominal Overall Length: 2.690 INCHES IN. 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.