SELF LOCKING TYPE BOLT SYSTEM

摘要

A self-tightening bolt faster structure is provided to guarantee a secure bonding state of a steel structure without performing an additional post process and maintain a bolt fastening state for a long period of time. A self-tightening bolt fastener structure includes a main screw part(11) formed at the head of a bolt(10) and a sub-screw part(12) having a diameter smaller than the diameter of the main screw. The sub-screw part is connected with the main screw part. A thread is formed at the front end of the bolt in a direction opposite to the direction of the thread of the main screw. The main screw part is combined with a main nut(21) and the sub-screw part is combined with a sub nut(22). A round protrusion is formed at one side of the main nut. The round protrusion and a screw hole of the main nut are concentric.