... function in in dynamic application synchronously. 1.Feature of DR series Flexible Coupling* One-piece metallic spring coupling, 4 screws to ... SpecificationProperty projectSpecific parameterD: External diameter of the connector15,18,20,22,25mmL: the long of the connector.20,25,30,35mmM ... ELECTRICAL CO.LTD Setsscrew Type Flexible Coupling, Encoder Coupling , DR series Coupling ( IBEST)