TORQUE RETENTION SCREW THREAD FASTENER AND CORRESPONDING THREAD ROLL DIE

摘要

A torque retention screw thread fastener and corresponding thread roll die to manufacture the screw thread fastener is disclosed. The torque retention thread forming screw comprises retention elements in the thread valley of the screw thread which reduces retro-grade rotation due to vibration loosening, and contributes to a reliable joint, to provide superior clamp load in the joint when the screw thread fastener is fully tightened and reduces the possibility of stripped assemblies.