The present invention relates to an adjustable threaded rod element (10) formounting a first construction element (50) on a second construction element (51) comprising, on a majority of its longitudinal axis, an outer thread (18), and in one end an inner (female) connector opening (15), and in the other end an outer (male) connector protrusion (12), wherein the inner connector opening (15) and the outer connector protrusion (12) are adapted to fit into each other so that the outer connector protrusion (12) of one threaded rod element can connect and lock into the inner connector opening (15) of another threaded rod element (10); wherein the thread (18) has one or more longitudinal sections (16) without threading.