the thread repair insert 10 includes the optional head 20 at an uppermost end thereof the head 20 preferably includes multiple facets 24 arranged to allow a torque applying device to effectively engage the head 20 preferably the facets 24 are arranged in a hexagonal pattern to be engaged by a variety of commonly available torque applying tools alternatively various other facet arrangements could be utilized or slots could be provided in the top surface 22 of the head 20 for receiving a screwdriver or other similarly shaped tool in addition an internal hex head may be formed on an internal sidewall 110 of the head 20 fig3 the head 20 is preferably radially symmetrical about a central axis 12 which passes through the thread repair insert 10 the neck 30 joins the head 20 to the shoulder 40 the neck 30 is preferably arranged as a single frustum with a greater diameter base 34 adjacent the head 20 and a lesser diameter crease or break off groove 32 adjacent the shoulder 40 the break off groove 32 and base 34 thus define parallel planes of the frustum of the neck 30 the break off groove 32 is preferably designed to have a cross sectional area which is less than a cross sectional area of almost any other portion of the thread repair insert 10 thus when torsional loads increase the.