Nitto Kohki Pneumatic Solutions

Medium Pressure up to 75 Bar

Nitto Kohki offers quick couplings for medium-pressure service up to 75 bar, suited to hydraulic, coolant and compressed-air systems operating above the standard low-pressure 19 bar range. This pressure group covers four series: the TSP Cupla (steel), the Zero Spill Cupla with leak-free disconnection, the TSP-BV Cupla (brass, FKM) for chemically resistant applications, and the SP Cupla Type A with the widest nominal size range in this group.

521 items
4 subcategories
1 manufacturer
Net prices plus VAT

View as Grid view List view

Show

per page

Buying guide

How to choose Medium Pressure up to 75 Bar

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

Technical features of the medium-pressure series

⚡ Working pressure up to 75 bar - for hydraulic and pneumatic systems above the low-pressure range

✓ Zero Spill technology - no fluid loss during disconnection or connection

⚙ FKM seal (TSP-BV Cupla) - brass body, resistant to mineral oils, fuels and solvents

↕ Wide size range (SP-A) - steel with NBR or FKM, nominal sizes 2-16

✦ TSP Cupla - steel coupling for general medium-pressure hydraulic service

Series comparison

Series	Body material	Seal	Key feature
TSP Cupla	Steel	-	General medium-pressure hydraulics up to 75 bar
Zero Spill Cupla	-	-	Leak-free disconnection, no drip losses
TSP-BV Cupla	Brass	FKM	Chemical resistance, nominal sizes 2-8 (BV types)
SP Cupla Type A	Steel / Stainless	NBR / FKM	Nominal sizes 2-16, widest selection

Typical applications

Typical applications: Hydraulic machine tools and presses operating between 20 and 75 bar, coolant systems in metal cutting, hydraulic power units in mobile machinery, chemical process plants with media compatibility requirements (FKM variants), and applications where leak-free coupling changes are mandatory (Zero Spill).

FAQ

Frequently asked questions about Medium Pressure up to 75 Bar

What are medium pressure pneumatic couplings up to 75 bar and where are they used industrially?

Medium pressure pneumatic couplings rated up to 75 bar are quick-disconnect fluid connectors designed for compressed air and pneumatic media applications requiring higher operating pressures than standard 10 bar systems. Nitto Kohki Multi Cupla Zerospill and TSP Cupla series serve automotive manufacturing, packaging machinery, hydraulic test equipment, and industrial automation where rapid connection changes are needed without system depressurization. These aluminum and stainless steel couplings with NBR, FKM, or EPDM seals enable efficient maintenance and reconfiguration of medium-pressure pneumatic circuits in production environments.

What technical specifications should I consider when selecting Nitto Kohki medium pressure couplings?

Critical selection criteria for Nitto Kohki medium pressure couplings include maximum working pressure of 75 bar, body material compatibility with your media and environment, and seal material selection based on temperature and chemical resistance requirements. The Multi Cupla Zerospill series uses aluminum construction with NBR seals for general compressed air, while SP-A and TSP Cupla series feature stainless steel bodies with NBR, FKM, or EPDM seals for enhanced chemical resistance. Port configurations range from 2S to 4S thread sizes, with specific models like MAM-A-4S8-CL and 16TSH offering different flow capacities and connection interfaces for your pneumatic system requirements.

Which international standards apply to Nitto Kohki medium pressure pneumatic couplings?

Nitto Kohki medium pressure pneumatic couplings comply with ISO 4414 for pneumatic fluid power systems and ISO 7241-1 for hydraulic quick-action couplings, ensuring proper safety factors and performance characteristics up to 75 bar operating pressure. The stainless steel construction in SP-A and TSP Cupla series meets material requirements for food-grade applications under relevant hygiene standards, while aluminum Multi Cupla components conform to pressure equipment directive requirements for industrial compressed air systems. Seal materials including NBR, FKM, and EPDM are selected to meet temperature and chemical compatibility standards for specific industrial applications requiring medium pressure operation.

What are the differences between Nitto Kohki Multi Cupla Zerospill, SP-A Cupla, and TSP Cupla series?

Multi Cupla Zerospill series features aluminum bodies with leak-free disconnection technology and NBR seals optimized for general compressed air applications, while SP-A Cupla series uses stainless steel construction with multiple seal options including NBR, FKM, and EPDM for enhanced chemical resistance. TSP Cupla series provides stainless steel bodies specifically designed for high-temperature and aggressive media applications with FKM or NBR seals, offering superior corrosion resistance compared to aluminum variants. The key distinction lies in material construction and seal compatibility, with aluminum Multi Cupla suitable for standard industrial air, while stainless steel SP-A and TSP series handle specialized media and harsh environmental conditions up to 75 bar working pressure.

What installation requirements and system compatibility considerations apply to 75 bar Nitto Kohki couplings?

Nitto Kohki medium pressure couplings require proper thread engagement with appropriate thread sealant or O-ring sealing depending on the specific model configuration, ensuring leak-tight connections at operating pressures up to 75 bar. System compatibility depends on matching coupling thread sizes like 2S, 3S, and 4S designations with existing pneumatic circuit connections, while considering flow capacity requirements for your application. Installation must account for pressure relief before disconnection on non-zerospill models, proper torque specifications for threaded connections, and adequate clearance for coupling operation in confined spaces typical of industrial machinery and automation equipment.

What safety ratings and operating parameters do Nitto Kohki medium pressure couplings provide?

Nitto Kohki medium pressure couplings are rated for continuous operation at 75 bar maximum working pressure with appropriate safety factors built into the design specifications. Operating temperature ranges vary by seal material, with NBR seals typically rated from -20°C to +80°C, FKM seals extending to +200°C for high-temperature applications, and EPDM seals offering enhanced low-temperature performance. The stainless steel TSP and SP-A series provide superior corrosion resistance for harsh industrial environments, while aluminum Multi Cupla variants offer cost-effective solutions for standard compressed air applications within the 75 bar pressure rating and specified temperature limits.

What maintenance intervals and service life expectations apply to Nitto Kohki 75 bar pneumatic couplings?

Nitto Kohki medium pressure couplings typically require visual inspection every 3-6 months for seal integrity, body wear, and proper locking mechanism function, with complete seal replacement recommended every 12-24 months depending on operating conditions and cycle frequency. Service life expectations range from 100,000 to 500,000 connection cycles for stainless steel TSP and SP-A series under normal industrial conditions, while aluminum Multi Cupla variants provide reliable service for 50,000-200,000 cycles at 75 bar operating pressure. Preventive maintenance includes regular cleaning of coupling faces, lubrication of moving parts with compatible pneumatic lubricants, and replacement of worn seals to maintain leak-free operation and system efficiency.