Abstract: A union for connecting cylindrical members has mating concentric truncated conical surfaces on annular flanges. Tubular spring pins driven into aligned assembly holes passing through the two flanges secure the union together. An alternate embodiment includes an intermediate body which may be flexible. TOGETHERThe present invention relates to coupling means designed to connect members together The term "member" here being considered in its broadest sense.To ensure the coupling between two members, connecting means are used which bring into action assembling members of the screw or bolt type intended to connect the members together directly or to connect said members and an intermediate element which may or may not be subjected to one or more elastic deformations.