Quick connect coupling 700R Cupla 700R-4S, steel - Nitto Kohki 391004001

Hydraulic breakers and rock crushers load every coupling point with pressure and impact at the same time. The Nitto Kohki 700R Cupla works up to 68.6 MPa (700 kgf/cm², 686 bar) and is held by a ring-lock system in the sleeve.

• Working pressure up to 68.6 MPa (700 kgf/cm², 686 bar, 9950 PSI)
• Metal-touch valves use no rubber seal, which gives excellent durability
• Two-way shut-off, socket and plug close automatically and no oil spills out on disconnection
• Special sleeve ring-lock system keeps the connection tight under vibration and impact
• Stand-alone leakage rate of 0.05 mL/min, measured at 0.2 MPa on the 700R-3SP and at 0.3 MPa on the 700R-4SP
• Body in nickel-plated special steel, seal in NBR (SG) for -20 °C to +80 °C, FKM (X-100) for -20 °C to +180 °C made to order

Technical data from the manufacturer catalogue

Dimensions

Dimensions in millimetres. Values in brackets apply in the connected condition.

Legend: L = overall length; T = thread or barb size

Models in this series 700R CUPLA

Every model of the series as printed in the manufacturer catalogue. The row of the article offered here is highlighted.

Operating principle

• Metal-touch valves use no rubber seal, and thus ensure excellent durability.
• Both socket and plug have metal touch automatic shut-off valves that prevent fluid spill out on disconnection.
• High pressure CUPLA for working pressures up to 68.6 MPa.
• For hydraulic pressure up to 68.6 MPa {700 kgf/cm2}.

Series comparison

Choose 700R CUPLA when the hydraulic line works above the pressure range of the sibling series: the highest rated peer here, 450B CUPLA, stops at 44.1 MPa {450 kgf/cm2}, while 700R CUPLA is rated up to 68.6 MPa {700 kgf/cm2}. All series in this group are two-way shut-off, so the pressure class and the available sizes 3/8 inch and 1/2 inch decide the choice. Where impulse pressure occurs in the line, 700R CUPLA must not be used.

Body and seal materials

Applications

• Hydraulic breakers and rock crushers
• Hydraulic circuits running at very high system pressure
• Coupling points under sustained impact loading
• Hydraulic oil lines in 3/8" and 1/2" sizes

Compatibility

Different sizes are not interchangeable. When coupled, fluid may flow in either direction, and the connection is operational in vacuum down to 1.3 Pa.

Standards and compliance

End sizes are 3/8" and 1/2", maximum tightening torques are 40 Nm at 3/8" and 85 Nm at 1/2", and the body material is nickel-plated special steel.

Safety and application notes

• Do not use in an environment where there is impulse pressure.
• Before use, please be sure to read "Safety Guide" described at the end of this book and "Instruction Sheet" that comes with the products.

All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 112. The complete catalogue is available for download on this page.