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Tangless threaded inserts provide permanent wear-resistant screw threads that completely eliminate the need for tang break-off and retrieval. They eliminate the need for tang break-off and tang retrieval and allow for non-destructive insert removal. Tangless inserts are easily adjusted and easily removed after installation.Features. Type - Free Running. Material - 304 Stainless Steel. Internal Thread size - 4 X 40 in.. Thread Type - UNC. Thread direction - Right Hand. Length - 0.168 in.. Free Coil diameter - 0.144 - 0.159. Drill size - 31 in.. Tensile strength - 200000. Rock well hardness - C43-C50. Application - For Metal. Package quantity - 100