Fastener, e.g. screw or bolt, comprises central body with six different length protruding sections with threaded end portions

摘要

The central body of the fastener has three protruding sections on one side and another three on the opposite side, all of which include threaded portions at their outer peripheral ends. The two outer sections are located at the same distance from the fastener central axis extending in the axial direction and they have a shorter length than the inner section in between. The central body extends in the cross-direction of the fastener and its two ends include threaded portions. All these portions combine to form an uninterrupted thread along the fastener central axis. An independent claim is also included for a construction system.