Low pressure up to 19 bar

HI Cupla

The Nitto Kohki HI Cupla is the most extensive steel quick coupling series for low-pressure service up to 19 bar, covering 167 items. The range includes plugs (P) and sockets (S) across a wide selection of nominal sizes and port geometries: PH (hose connection), PM (metal thread), PF (flange) and SH, SM and SN sockets. Nominal sizes run from 17 to 800, with the smaller sizes (17-40) targeting standard pneumatic tools and the large nominal sizes (400, 600, 800) for high-volume compressed-air mains. SH socket types carry an NBR seal; PH, PM and PF plug types have no internal seal.

167 items
1 manufacturer
Net prices plus VAT

View as Grid view List view

Show

per page

Buying guide

How to choose HI Cupla

What matters when choosing: properties, comparison and typical applications.

Technical features

⚙ Steel body - robust for continuous duty in industrial compressed-air systems

✓ NBR seal (SH sockets) - for general compressed-air service up to 19 bar

⚡ 167 items, nominal sizes 17-800 - PH, PM, PF (plugs) and SH, SM, SN (sockets)

↕ Large nominal sizes - 400, 600 and 800 for compressed-air mains and industrial compressor installations

✦ HI Cupla standard - the most widely used Nitto Kohki coupling standard for general pneumatics

Nominal sizes and connection types

Nominal size group	Plug types	Socket types	Seal
17, 20, 30, 40	PH, PM, PF	SH (NBR), SM, SN	NBR (SH) / none
400, 600, 800	PH, PM, PF	SH (NBR), SM, SN	NBR (SH) / none

PH = hose connection, PM = male metal thread, PF = flange; SH = socket with NBR, SM = metal socket, SN = standard socket.

Typical applications

Typical applications: Compressed-air supply to pneumatic tools in manufacturing and assembly (nominal sizes 17-40), main line connections at compressor installations (nominal sizes 400-800), hose and pipe connections in industrial compressed-air networks, and general pneumatic applications in workshop, maintenance and service environments up to 19 bar.

FAQ

Frequently asked questions about HI Cupla

What are Nitto Kohki HI Cupla quick-disconnect couplings and what industrial applications use them?

Nitto Kohki HI Cupla quick-disconnect couplings are precision-engineered pneumatic connectors designed for low-pressure applications up to 19 bar operating pressure. These stainless steel (SUS) couplings serve manufacturing industries including automotive assembly, food processing, pharmaceutical production, and general industrial automation where frequent connection and disconnection of pneumatic lines is required. The HI Cupla series features both FKM and NBR sealing materials to accommodate different media compatibility requirements in production environments.

What technical specifications determine HI Cupla coupling selection for pneumatic systems?

HI Cupla coupling selection depends on three critical technical parameters: port size designation (400, 600, or 800 series), connection type (SH socket with shut-off valve, SM socket without shut-off valve, or SF plug), and seal material compatibility. The 400 series handles smaller flow rates while 800 series provides maximum flow capacity at 19 bar maximum working pressure. FKM seals offer superior chemical resistance for aggressive media, while NBR seals provide cost-effective performance for standard compressed air applications in industrial pneumatic systems.

Which international standards apply to Nitto Kohki HI Cupla pneumatic quick-connect couplings?

Nitto Kohki HI Cupla couplings comply with ISO 4414 pneumatic safety standards for compressed air systems and ISO 7241 specifications for hydraulic quick-action couplings adapted for pneumatic use. The stainless steel construction meets DIN 1.4301 material standards for corrosion resistance, while the design follows ISO 5598 fluid power connector specifications. These certifications ensure compatibility with European industrial pneumatic systems and compliance with machinery directive requirements for safe operation up to 19 bar working pressure.

What are the differences between HI Cupla 800SH, 800SM, and 800SF coupling variants?

The HI Cupla 800 series variants differ primarily in their valve configuration and connection function: 800SH sockets feature integrated shut-off valves that automatically close when disconnected, preventing air loss and contamination entry. The 800SM sockets operate without shut-off valves for continuous flow applications where pressure drop minimization is critical. The 800SF plugs provide the male connection component designed to mate with either SH or SM sockets, maintaining 19 bar pressure rating across all variants while using identical SUS stainless steel construction and FKM or NBR seal options.

What installation requirements and system compatibility apply to HI Cupla pneumatic couplings?

HI Cupla installations require clean, dry compressed air systems with filtration to 40 microns and proper line sizing to match the 400, 600, or 800 series flow capacity. Thread connections follow standard pneumatic fittings specifications, with installation torque applied to the hexagonal coupling body rather than the release sleeve to prevent internal damage. System compatibility extends to all standard pneumatic components operating within the 19 bar pressure range, including actuators, valves, and air preparation equipment commonly found in industrial automation applications.

What safety ratings and environmental operating limits apply to HI Cupla couplings?

HI Cupla couplings operate safely within ambient temperatures from -10°C to +60°C for NBR seals and -20°C to +200°C for FKM seals, maintaining full 19 bar working pressure rating throughout these ranges. The stainless steel construction provides inherent corrosion resistance equivalent to IP65 environmental protection when properly installed with appropriate thread sealants. Safety factor calculations include 4:1 minimum burst pressure ratio, ensuring reliable operation in industrial environments where sudden pressure fluctuations may occur during normal pneumatic system cycling.

What maintenance schedule and service life expectations apply to Nitto Kohki HI Cupla couplings?

HI Cupla couplings require quarterly visual inspection for seal integrity and annual replacement of NBR seals in continuous-duty applications, while FKM seals typically provide 24-month service intervals under normal industrial conditions. Expected service life reaches 100,000 connect-disconnect cycles when operated within the 19 bar pressure rating and proper ambient temperature ranges. Maintenance procedures include checking for proper engagement, testing shut-off valve operation on SH variants, and monitoring for air leakage at connection points to ensure continued pneumatic system efficiency and safety compliance.