Buy 450B Cupla - High-Pressure Pneumatic

High-Pressure up to 700 Bar

The Nitto Kohki 450B Cupla is a high-pressure quick coupling in steel with NBR seals, designed for operating pressures up to 450 bar. The range includes a plug (450B-3P) and a socket (450B-3S) in nominal size 3. The steel body with NBR elastomer seal allows use with hydraulic oils and comparable fluids in test and industrial equipment.

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Quick connect coupling 450B Cupla 450B-3P, R 3/8, steel - Nitto Kohki 369803007
€30.26
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Quick connect coupling 450B Cupla 450B-3S, steel - Nitto Kohki 369803006
€70.59

Buying guide

How to choose 450B Cupla

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

Technical features

⚡ Max. operating pressure 450 bar - steel housing for high-pressure hydraulics and test systems

✓ NBR seal - suitable for hydraulic oils and mineral-oil-based media

⚙ Nominal size 3 - compact design for restricted installation spaces

✦ Plug and socket available - 450B-3P (Plug) and 450B-3S (Socket)

Type overview

Type	Design	Nominal size	Material	Seal
450B-3P	Plug	3	Steel	NBR
450B-3S	Socket	3	Steel	NBR

Typical applications

Typical applications: Hydraulic test benches and medium-to-high-pressure test lines, machine tools with high-pressure coolant circuits, pressure-testing systems for pipelines and fittings, and laboratory equipment for pressure measurements up to 450 bar.

FAQ

Frequently asked questions about 450B Cupla

What is a Nitto Kohki 450B Cupla and what industrial applications use these high-pressure quick couplings?

The Nitto Kohki 450B Cupla is a steel-bodied quick coupling designed for high-pressure pneumatic and hydraulic applications up to 700 bar operating pressure. These couplings are primarily used in industrial manufacturing, hydraulic test systems, pneumatic automation equipment, and high-pressure fluid transfer applications where rapid connection and disconnection is required. The 450B series features NBR sealing for compatibility with compressed air, hydraulic oils, and various industrial fluids. Industries utilizing these couplings include automotive manufacturing, aerospace testing, heavy machinery production, and hydraulic system integration where reliable pressure containment and quick service access are critical operational requirements.

What are the key technical selection criteria for choosing between different 450B Cupla variants?

The primary selection criteria for 450B Cupla variants include maximum operating pressure rating up to 700 bar, connection thread type and size, and sealing material compatibility with system fluids. The 450B-3S socket variant and 450B-3P plug variant both feature steel construction with NBR sealing rings for standard pneumatic and hydraulic media compatibility. Critical selection factors include the required flow coefficient for system performance, ambient temperature range for NBR seal operation, and thread specification matching existing system components. The steel body construction provides superior pressure resistance compared to brass alternatives, while NBR sealing ensures compatibility with mineral-based hydraulic oils and compressed air systems operating within standard industrial temperature ranges.

Which international standards and certifications apply to Nitto Kohki 450B Cupla high-pressure couplings?

Nitto Kohki 450B Cupla couplings are manufactured to comply with ISO 4414 pneumatic system standards and ISO 4413 hydraulic system requirements for high-pressure applications. The steel construction and NBR sealing materials meet DIN EN ISO 1179 threading standards for hydraulic and pneumatic connections. These couplings are designed according to pressure vessel directive requirements for components operating up to 700 bar, ensuring compliance with European machinery directive standards. The manufacturing process follows ISO 9001 quality management systems, and the product design incorporates safety factors required by industrial fluid power standards. Material specifications comply with relevant DIN steel grades for pressure-bearing components in hydraulic and pneumatic systems.

What are the differences between the 450B-3S socket and 450B-3P plug variants?

The 450B-3S socket variant functions as the receiving component with internal sealing mechanisms and spring-loaded sleeve operation, while the 450B-3P plug variant serves as the male insertion component with external sealing surfaces. Both variants feature identical steel body construction with NBR sealing rings and are rated for the same 700 bar maximum operating pressure. The socket component typically remains permanently installed in the system, incorporating shut-off valve mechanisms to prevent fluid loss during disconnection, while the plug component connects to hoses or portable equipment. Thread specifications and port sizes are matched between socket and plug variants to ensure proper mating and pressure seal integrity. The coupling mechanism provides secure connection with visual and tactile confirmation of proper engagement for safe high-pressure operation.

What are the installation requirements and system compatibility considerations for 450B Cupla couplings?

Installation of 450B Cupla couplings requires proper thread engagement according to DIN EN ISO 1179 standards, typically involving thread sealant or PTFE tape for leak-free connections up to 700 bar operating pressure. System compatibility includes verification of fluid media compatibility with NBR sealing materials and steel body construction, ensuring operating temperature remains within NBR service range of approximately -20°C to +80°C. Port preparation must include proper thread cutting, deburring, and cleanliness standards to prevent contamination and ensure seal integrity. The coupling system requires adequate clearance space for manual operation of the connection mechanism and should be positioned to avoid mechanical stress on the coupling body. Proper installation includes pressure testing at 1.5 times operating pressure to verify seal integrity before system commissioning.

What are the pressure ratings, temperature limits, and safety specifications for 450B Cupla couplings?

The Nitto Kohki 450B Cupla operates at maximum working pressure of 700 bar with NBR sealing material temperature range of -20°C to +80°C for standard industrial applications. The steel body construction provides adequate safety factor above the 700 bar rating, incorporating burst pressure margins according to pressure equipment directive requirements. Operating temperature limits are primarily determined by NBR seal material properties, with reduced pressure ratings at elevated temperatures following standard derating curves. The coupling design includes automatic shut-off valves to prevent fluid loss and pressure drop during disconnection, enhancing operational safety in high-pressure systems. Safety features include visual connection indication and positive locking mechanisms to prevent accidental disconnection under pressure, meeting industrial safety standards for high-pressure fluid power applications.

What maintenance schedule and inspection requirements apply to 450B Cupla high-pressure couplings?

Maintenance of 450B Cupla couplings requires periodic inspection of NBR sealing rings every 500 operating cycles or annually, whichever occurs first, with particular attention to seal wear and fluid compatibility degradation. Visual inspection should check for steel body surface corrosion, thread damage, and proper spring mechanism operation in the coupling sleeve assembly. Seal replacement intervals depend on operating pressure, cycle frequency, and fluid media, typically ranging from 12 to 24 months in standard hydraulic oil applications at 700 bar operating pressure. Coupling performance testing should include leak detection at full operating pressure and verification of proper shut-off valve operation during connection and disconnection cycles. Preventive maintenance includes periodic cleaning of coupling faces, lubrication of moving components with compatible lubricants, and documentation of service cycles to predict seal replacement timing based on actual operating conditions.

How does the 700 bar pressure rating of 450B Cupla compare to standard pneumatic coupling ratings?

The 450B Cupla's 700 bar pressure rating significantly exceeds standard pneumatic coupling capacities, which typically operate at 10 to 16 bar for compressed air applications, positioning it in the high-pressure hydraulic coupling category. This pressure rating makes the 450B suitable for hydraulic test equipment, high-pressure cleaning systems, and industrial hydraulic circuits that require substantially higher operating pressures than conventional pneumatic systems. The steel construction with NBR sealing enables operation at pressures approximately 40 to 70 times higher than standard pneumatic quick couplings, which commonly use brass or aluminum bodies with lower pressure ratings. Industrial applications requiring this pressure capability include hydraulic press systems, heavy machinery hydraulics, and specialized testing equipment where 700 bar operating pressure is necessary for system functionality and performance requirements.