What is a locing thread insert Edit: Xinxiang Changling Metal Products Co.,Ltd Date: 2016-09-10 The locking action is achieved by one or more of the insert coils having a series of straight segments or chords;When the bolt enters the grip coil ; These chordal segments flex outward ,creating pressure on the bolt ; The pressure is exerted between the flanks of the bolt thread to establish an exnsive positive and consistent self locking rorque over more cycles than anyother prevailing torque mechanism !