![]() ![]() ![]() This list is longer than you might think, and includes wrought and cast aluminum and aluminum alloys, copper, brass, stainless steels, carbon steels, and zinc diecasting alloys. Generally, materials that produce a continuous chip when drilling are good candidates for thread forming. This includes light metals and light metal alloys as well as steels and other materials with tensile strength to 1200 N/mm 2 and hardness below about R C 35 – 40. Regal Cutting Tools stocks 4, 6, 8, 10 and 12 extension taps, both large and small shank up to 1 ¼ diameter. Since the metal’s structure is cold worked along the thread profile, the threads produced are generally stronger and have a smooth, burnished surface finish.įorming taps must be applied in materials that cold form well. Large shank and small shank extension taps are used when reach to the part, or in the case of small shank tools the tap can cut threads longer than the length of thread of the tap. Rather, the process displaces the material to generate the thread form. ![]() Unlike thread cutting, no material is removed during thread forming. For ductile work materials, thread forming can provide better size control and stronger threads while improving tool life and productivity. TAPPING SPEEDS Form taps operate most efficiently at spindle speeds 1-1/2 to 2 times faster than those recommended for conventional cutting taps, especially in softer materials and/or with fine pitch forming taps. The vast majority of threaded holes–more than 90%, according to one supplier of taps and other cutting tools–are produced using cutting taps.īut many of those threads could be produced using forming taps, which can provide multiple advantages. See below for tap/drill size formulas, and formulas to determine maximum and minimum drill hole sizes for appropriate percent of thread. In the right application, thread forming can boost quality and throughput ![]()
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