A single conductor in a multi-conductor cable is connected to a terminating part on a contact pin or contact socket in a plug or a socket contact, possibly on a circuit board or a contact piece, by inserting a stripped, metallic center conductor longitudinally between at least one pair of gripping claws of an electrically conductive material. The gripping claws are shaped so that an inner, substantially forward facing and sharp edge portion touches the surface of the metallic conductor along a substantially helical curve having a large pitch angle. Thereby, if an attempt is made to pull the conductor in a rearward direction, the sharp edge portion will carve lockingly into the surface of the metallic conductor and cause locking of the conductor.