Quick connect coupling 280 Cupla 280-6S, steel - Nitto Kohki 432106100

Hydraulic circuits in the 300 bar class need a coupling that takes pressure impacts and still adds little pressure loss. The 280 Cupla works at 31.5 MPa in 1/4 and 3/8 inch and at 27.5 MPa in 1/2, 3/4 and 1 inch, and it complies with the international standard ISO 7241-1A.

• Working pressure of 31.5 MPa in sizes 1/4 inch and 3/8 inch and 27.5 MPa in 1/2 inch, 3/4 inch and 1 inch, made for high pressure hydraulic lines.
• Built to ISO 7241-1A, so the interface follows an internationally defined profile.
• Special steel body with bright chromate conversion coating in silver plus additional quenching to withstand hydraulic pressure impacts.
• Minimum cross-sectional area from 11.4 mm2 on 280-2SP up to 235.6 mm2 on 280-8SP, with low pressure loss for applications that need high flow rates.
• Automatic shut-off valves in both socket and plug prevent hydraulic oil from spilling out on disconnection.
• Air admixture on connection of 0.37 mL on 280-2SP up to 16.04 mL on 280-8SP, with an NBR seal for -20 °C to +80 °C.

Technical data from the manufacturer catalogue

Dimensions

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

Legend: L = overall length; D = socket outside diameter; T = thread or barb size

Models in this series 280 CUPLA

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

Operating principle

• Conforms to international standard ISO 7241-1A.
• Hydraulic CUPLA with the working pressure up to 27.5 to 31.5 MPa {281 to 321 kgf/cm2}.
• Structure keeps pressure loss extremely low, particularly ideal for hydraulic applications requiring high flow rates.
• Both socket and plug have built-in automatic shut-off valves to prevent fluid spill out when disconnected.
• Special steel body material is adopted for its excellent strength and additional quenching treatment is done to withstand hydro pressure impacts.
• Copes with higher pressure lines in hydraulic equipment.
• Low pressure loss is ideal for hydraulic equipment.
• Fluid flow can be bi-directional when socket and plug are connected.

Series comparison

Choose 280 CUPLA when the hydraulic circuit works above the 20.6 to 21.0 MPa {210 to 214 kgf/cm2} rating of HSP CUPLA, HYPER HSP CUPLA, 210 CUPLA, HSU CUPLA and S210 CUPLA but stays within 27.5 to 31.5 MPa {281 to 321 kgf/cm2}. All of these series shut off on both sides, so the step up changes the pressure class and not the valve behaviour. For higher pressures there are 350 CUPLA at 34.5 MPa {352 kgf/cm2}, 450B CUPLA at 44.1 MPa {450 kgf/cm2} and 700R CUPLA at 68.6 MPa {700 kgf/cm2}; where the mating half is built to ISO 7241-1A, 280 CUPLA conforms to that standard.

Body and seal materials

Applications

• Hydraulic pressure control equipment operating up to 31.5 MPa
• General hydraulic engineering where an ISO 7241-1A interface is specified
• High flow lines in which the pressure loss across the coupling has to stay low
• Installations exposed to hydraulic pressure impacts, which the quenched special steel body is made for
• Vacuum service down to 1.3 Pa, released for the coupled pair only and not for socket or plug on its own

Compatibility

Different sizes cannot be connected. There is no interchangeability between 280 Cupla and HSP Cupla or 210 Cupla, and these parts must not be coupled even where some sizes are approximate.

Standards and compliance

The 280 Cupla complies with the international standard ISO 7241-1A.

Safety and application notes

• Before use, please be sure to read "Safety Guide" described at the end of this book and "Instruction Sheet" that comes with the products.
• There is no interchangeability between 280 CUPLA and HSP CUPLA, 210 CUPLA or 450B CUPLA. Do not connect each other even if some sizes are approximate.
• Socket and plug of different sizes cannot be connected.
• Do not exceed the maximum tightening torque given for each thread size.

All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 103. The complete catalogue is available for download on this page.