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Thread forming tap, modified bottoming, style: general-purpose, cobalt, finish: steam oxide, size: #2, pitch: 56, thread: UNC, pitch diameter limits: H2, standard projection, shank diameter 0.141", for forming internal threads in aluminum, carbon, alloy, die and stainless steels, tolerance: 3B, standards: 14001. Cobalt and powdered metal thread forming taps create strong threads without creating chips. For forming internal threads. Also for use with aluminum as well as carbon, alloy, die, and stainless steels.