ARPEX couplings of the ARP-6 series are outstanding for their application-optimized construction. The two types NAN and MCECM have been specially designed for drives with uniform to medium loads and at the same time meet the requirements of API 610. The type MCECM with preassembled CEC intermediate unit can also be optionally designed to API 671. A special catcher device serves to secure the intermediate spacer in the event of plate breakage. Their use in potentially explosive environments in accordance with Directive 94/9/EC is possible.