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N-ARPEX All-Steel Coupling: Backlash-free, rigid-flexible for high-torque industrial drives.
The N-ARPEX All-Steel Coupling, developed by Flender, is a high-performance torsionally rigid, backlash-free multi-disk coupling engineered for reliable power transmission in diverse industrial scenarios[2][4]. A
Constructed with all-steel components, the coupling features stainless spring steel disk packs and high-grade steel or cast iron hubs, ensuring exceptional durability and resistance to wear[1][4]. It
A core advantage is its unique combination of torsional rigidity and flexural elasticity, enabling backlash-free torque transmission while compensating for axial, radial, and angular shaft misalignments (up to 1°)
Certified to comply with the ATEX directive (2014/34/EU) and meeting API 610 and API 671 standards, the coupling is suitable for potentially explosive atmospheres and critical applications like pump and turbine drives[1][3]
Common applications span petrochemistry, power generation, mining, steel production, and pulp and paper industries, including pumps, fans, compressors, generators, turbines, and rolling mills[4][5][6]. Overall, the N-ARPEX All-Steel Coupling is a reliable, high-performance solution that balances rigidity, flexibility, and safety, delivering consistent, maintenance-free power transmission for diverse industrial needs worldwide.
Investment costs, lifecycle costs, power-to-weight ratio, fitness for use and the cost of purchasing couplings are key considerations for equipment manufacturers.
With the introduction of the new N-ARPEX® all-steel multi-disk coupling Flender is continuing the success story of the proven ARPEX® series of couplings. The N-ARPEX is currently the most powerful coupling on the market due to the consistent further development of the ARPEX – a leap in performance that in this size could only be achieved by means of various design features. With the N-ARPEX, Flender delivers the optimum price-performance ratio.
With our all-steel couplings, the reliable transmission of torque between the shafts to be connected is backlash-free, torsionally rigid and flexurally elastic. This enables them to compensate for axial, angular and radial misalignment. Our multi-disk couplings are not prone to wear and are maintenance-free.
The couplings have been designed for use in potentially explosive environments as defined in Directive 2014/34/EU (ATEX) and comply with the requirements in standards
API 610 and API 671.
Lower costs through higher performance
An optimized plate pack design and a revised component design enable transmission of very high torques and speeds.
Low bearing loads through low weight
A marked increase in bore capacities with standard hubs increases performance capability and lowers the N-ARPEX’s weight.
Versatility for maximum fitness for use
Its suitability for use at low temperatures between –60 °C and +280 °C and its high misalignment capacities of up to 1° enable the N-ARPEX to be used for many different purposes in special conditions.
Easy selection and reduction in storage costs
The bundling of the ARPEX ARS®, ARC® and ARP® series together to make a single serie N-ARPEX ARN® results in a reduction in complexity from 67 to 37 couplings. Thus, storage costs are reduced. Choosing the desired coupling is much easier.
We make the N-ARPEX your N-ARPEX. Beyond the broad standard program, we give you the opportunity to customize the coupling according to your specific needs. Thus, in addition to various hub and flange types, we can offer you special designs such as one which prevents leak currents between coupled devices. Our coupling experts are happy to advise you.
