Electric connector, including first and second connector parts (10, 20) which can be coupled together and which comprise respectively first and second contact elements (11, 21) and first and second supports (1a, 3a) which support respectively the first and second connector parts and can be assembled together by means of screwing engagement. The first and second connector parts comprise, respectively, first and second support ring structures (13, 23) which carry the first and second contact elements respectively. Pins and corresponding locating and drive means (31, 32) are designed to make the first and second support rings structures rotationally integral during relative engagement of first and second supports and cause first and second contact elements to align with one another. The first connector part also comprises a base structure (15) on which the first support ring structure is movably mounted. Cam members (18) are arranged between base structure and support ring structure.