Low pressure up to 19 bar

Compact Cupla

The Nitto Kohki Compact Cupla is a low-pressure quick-release coupling for applications up to 19 bar, available in two material versions: lead-free special brass (BSBM) with FKM seal, and stainless steel SUS304 with FKM or EPDM seal. The range covers plugs (CO-xP) and sockets (CO-xS) in nominal sizes 1, 40, and 60, with G external thread (M), G internal thread (F), and nipple (N). The compact design is optimised for minimum installation length.

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Buying guide

How to choose Compact Cupla

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

Technical features

⚙ BSBM or SUS304 - Lead-free special brass for standard compressed air, stainless steel for corrosive or food-grade environments

⬡ FKM and EPDM seals - FKM for mineral oils and synthetic media, EPDM for water and food-relevant applications

↕ Nominal sizes 1, 40, 60 - Three steps covering the range from minimal flow to medium volume flow

✓ Three connection forms - G external (M), G internal (F), and nipple (N) as plug and socket variants

Material and seal overview

Material	Seal	Type examples	Application
BSBM	FKM	CO-1PM, CO-1PF, CO-40PN, CO-60PN; CO-1SM, CO-1SF, CO-40SN, CO-60SN	Compressed air, general pneumatics
SUS304	EPDM	CO-1PM, CO-1PF, CO-40PN, CO-60PN (SUS/EPDM)	Water, food-grade media
SUS304	FKM	CO-1PM, CO-1PF, CO-40PN, CO-60PN (SUS/FKM)	Oils, synthetic fluids, elevated temp.

Typical applications

Typical applications: Compact pneumatic controls with limited installation space, connections on miniature valves and pneumatic instruments, food machinery pneumatics (SUS304/EPDM), laboratory automation and analytical equipment, and general compressed-air installations up to 19 bar in production and assembly.

FAQ

Frequently asked questions about Compact Cupla

What are Nitto Kohki Compact Cupla pneumatic quick couplings and their primary industrial applications?

Nitto Kohki Compact Cupla pneumatic quick couplings are precision-engineered connection systems designed for low-pressure pneumatic applications up to 19 bar operating pressure. These compact couplings serve critical functions in manufacturing automation, compressed air distribution systems, and hydraulic circuits across automotive, food processing, and general industrial sectors. The Compact Cupla series features stainless steel SUS304 and brass BSBM body construction with EPDM or FKM sealing materials, providing reliable fluid connection in production environments requiring frequent line disconnection and maintenance access.

What are the key technical selection criteria for Compact Cupla quick couplings with specific pressure and material specifications?

Compact Cupla selection requires evaluating maximum working pressure of 19 bar, body material compatibility between SUS304 stainless steel for corrosive environments or BSBM brass for standard applications, and seal material choice between EPDM for general purpose use or FKM for chemical resistance. Port configurations include CO-40SN and CO-60SN socket variants with different bore diameters, plus CO-1SM male and CO-1SF female plug options for system-specific connection requirements. Operating temperature range varies by seal material, with EPDM seals suitable for -30°C to +150°C and FKM seals rated for -20°C to +200°C continuous service.

Which international standards and certifications apply to Nitto Kohki Compact Cupla pneumatic couplings?

Nitto Kohki Compact Cupla couplings comply with ISO 4414 pneumatic system safety standards and ISO 5675 quick coupling dimensional specifications for industrial compressed air applications. The stainless steel SUS304 construction meets ASTM A240 material standards for corrosion resistance, while the overall design adheres to European EN 983 safety requirements for pneumatic quick-acting couplings. Manufacturing follows ISO 9001 quality management protocols ensuring consistent performance characteristics across production batches, with pressure testing conducted per ISO 1402 hydraulic coupling verification procedures.

What are the main differences between Compact Cupla product variants like CO-40SN, CO-60SN, and CO-1SM models?

The CO-40SN and CO-60SN represent different socket sizes with varying bore diameters for flow capacity requirements, while CO-1SM designates male threaded plugs and CO-1SF indicates female threaded plugs for mating connections. Body material variants include SUS304 stainless steel versions for corrosive media or clean room applications versus BSBM brass models for standard compressed air systems with cost optimization. Seal material options between EPDM and FKM provide temperature and chemical compatibility differences, with FKM variants offering superior resistance to oils, fuels, and aggressive chemicals compared to standard EPDM seals.

What are the installation requirements and system compatibility specifications for Compact Cupla connections?

Compact Cupla installation requires G1/8 to G1/2 BSP threaded ports with proper thread sealant application rated for pneumatic service pressures up to 19 bar maximum working pressure. The coupling design ensures compatibility with standard compressed air systems, hydraulic circuits operating below maximum pressure threshold, and automated production lines requiring frequent connection cycles. Proper installation includes torque specification adherence per thread size, adequate clearance for coupling operation mechanism, and system pressure testing at 1.5 times working pressure before commissioning to verify leak-tight performance across all connection points.

What are the safety ratings, IP protection class, and operating pressure-temperature limits for Compact Cupla couplings?

Compact Cupla couplings operate safely at maximum working pressure of 19 bar with proof pressure testing at 28.5 bar per ISO safety factor requirements, while operating temperature ranges from -30°C to +150°C with EPDM seals or -20°C to +200°C with FKM seal variants. The coupling design provides IP65 ingress protection against dust and water jets when properly connected, ensuring reliable operation in industrial environments with washdown procedures. Safety features include automatic valve closure during disconnection to prevent pressure loss and spring-loaded locking mechanisms that require deliberate operator action to prevent accidental disconnection under system pressure.

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

Compact Cupla couplings require visual inspection every 3 months for seal wear, body corrosion, and proper locking mechanism function, with complete seal replacement recommended every 12-18 months depending on operating cycles and media compatibility. Service life typically exceeds 500,000 connection cycles when operated within specified pressure and temperature limits, with EPDM seals providing approximately 3-5 years service life and FKM seals extending to 5-7 years under normal industrial conditions. Maintenance procedures include periodic leak testing at operating pressure, lubrication of moving parts with pneumatic-grade oil, and replacement of worn sealing elements using genuine Nitto Kohki spare parts to maintain original performance specifications.