Quick connect coupling 350 Cupla 350-8S-8G, steel - Nitto Kohki 439815185

In hydraulic circuits with strong pressure peaks, the coupling decides how much air enters the oil on connection. The Nitto Kohki 350 Cupla works up to 34.5 MPa and lets only 0.1 mL to 2.0 mL of air into the line when coupled, depending on size.

• Working pressure up to 34.5 MPa (345 bar, 5000 PSI), designed for hydraulic lines with large pressure fluctuations
• Shut-off valves in both socket and plug close on disconnection, so the oil stays in the line
• Air admixture on connection of only 0.1 mL on the 350-2SP up to 2.0 mL on the 350-16SP, measured with hydraulic oil at 40 °C
• Locking mechanism against accidental disconnection keeps the joint tight under vibration and impact
• The seal does not protrude into the fluid path when coupled, which extends seal life
• Nickel-plated special steel body, quenched to take pressure impulses

Technical data

Applications

• Hydraulic power units and hydraulic lines up to 34.5 MPa
• Circuits with pronounced pressure fluctuations and impulses
• Lines exposed to vibration or impact where the lock prevents disconnection
• Connections with high flow rate, the minimum cross-sectional area runs from 34.2 mm² on the 350-2SP to 907.9 mm² on the 350-16SP
• Release of residual pressure through the optional PAD-2 purge adapter rated for 35.0 MPa

Compatibility

Sockets and plugs of different sizes cannot be connected, the exceptions being 350-2SP with 350-3SP and 350-10SP with 350-12SP. Once coupled, fluid flows in either direction, and the range is not suitable for vacuum in either the connected or the disconnected state.

Standards and compliance

End connections are female Rc 1/4 to Rc 2 threads, G threads on request, the sealing materials are nitrile rubber (NBR, marked SG) for -20 °C to +80 °C and fluoro rubber (FKM, marked X-100) for -20 °C to +180 °C.