Select Key Locking Thread Inserts – UNC | MSC Industrial Supply Co.

Key Locking Thread Inserts are an ideal solution to repair stripped, damaged and worn threads or to provide thread reinforcement in a weaker parent material, especially when the mating stud or bolt will be removed frequently. They provide strong, permanent threads in virtually any material – ferrous, non-ferrous or non-metallic. The insert’s locking keys are driven down into the tapped threads of the parent material during installation creating a positive mechanical lock that prevents rotation due to vibration or torsion. The increased wall thickness and greater external thread area of these Extra Heavy Duty Threaded Inserts offer superior pull-out strength, stability and longer life. These inserts should be used in materials with lower ultimate shear strength to obtain maximum pull-out strength and holding power.