Keenserts, Thread Repair Inserts, The Solid Alternative for Thread Repair. Designed to repair damaged threads or for use in original equipment. Available in stainless steel, Keenserts are manufactured and tested according to MIL-I-45914 rev A. This rigorous process includes testing internal and external threads (proof and pull-out), torque-out, locking torque (where applicable), non-destructive testing, and magnetic permeability testing. In addition, Keenserts offer complete traceability and are available in internal thread-locking and miniature sizes.