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Product DescriptionKey locking inserts provide high strength and reliability and are designed to provide high resistance to rotation and pull-out loads. After installation into the tapped hole, the keysert on each key locking inserts are driven down through the threads of the parent material, locking the insert firmly and permanently in place. Application:Can be used in virtually any material including aluminum, cast iron, steel, plastics. Category:Thinwall;Heavy wall; Extra Heavy Duty;Solid Insert Materials & Finishes:Materials : carbon steel, stainless steel Finishes : cadmium plate, dry film lubricant As a kind of thread repairing method, the keysert can quickly and effectively repair the damaged thread; key locking screw insert is used on low-strength materials, which can greatly enhance the strength of the threaded hole. Key locking thread insert is a fastener that has the screw both the internal and external wall.It is mainly used in some areas, such as : aircraft,Vibration machinery,Military industry and other industry with high thread strength . ,p>Installation 1.Drill out old threads with a standard drill.Note: Drill is oversized see charts for proper dimensions. Chamfer the hole with a standard countersink(82° -100° ) 2.Tap new thread with a standard tap. See charts for proper size and depth. 3.Screw in the insert until slightly below surface. 4.Drive keys down with several hammer taps on the proper installation tool.