Abstract: A connector for connecting two lengths of electric cable, especially of h current capabilities, comprising a male terminal or plug, traversed by a pin, and a female terminal or socket carrying a sleeve freely rotatable thereon but resiliently urged longitudinally toward the end of the socket by a resilient means on the socket. When inserted in the socket, the contacting surfaces on both plug and socket are positively engaged and a rotation of the sleeve further interlocks the pin and sleeve by increasing the resilient load of the resilient means by a slight relative longitudinal displacement of the sleeve resulting from the rotation thereof. This connector ensures a highly efficient electrical contact between the cable ends and eliminates all risk of accidental disconnection.