![]() ![]() But it’s the machinist who decides which tapping style to use depending on the job at hand. Others suggested that the standard drill size for M6 is 5mm. I got a 13/64 (5.159mm) giving you about 77 thread engagment. I suggested number 6, 7, or 8, or a 13/64. Compare that to cut threads, which because of the tools used, cause grain structure to essentially fracture.Īlso, formed taps have a longer life, as they last about three to 20 times longer than cut taps.Ĭutting taps and forming taps both have benefits and limitations from stronger threads to greater compatibility. On another site, someone wanted the proper drill size for a M6 (6mm x 1mm pitch) tap. But machinists aren’t limited to the materials when they decide to cut taps.Ĭutting taps also have the upperhand regarding horsepower, as this threading method requires less power than forming taps.įormed threads are stronger because the grain flow of materials is compressed at the crest and root of the thread form. When machinists use forming taps, they can only use the process on aluminum, soft steel and nonferrous metals. The two threading methods tap holes differently, but they also have a handful of other differences, starting with the type of thread each method produces.Ĭutting taps are more versatile than forming taps and can be used with more materials. Additionally, forming taps usually require a larger hole because this style causes a material to thread away and into the threads of the tap. Use uncoated taps for short production runs. All have a plug chamfer with 3-5 chamfered cutting threads, so theyre suitable for start-to-finish tapping. With a square shank, theyre compatible with tap wrenches and tap holders for drill presses and milling machines. Forming taps involves the displacement of a material (like metal) within a hole. Theyre made of high-speed steel for use on most metal and plastic. Unlike cutting taps, forming taps create external threads. This gradual cutting motion allows a tap to smoothly enter a hole. This process then leaves an internal thread that meets the machinist’s desires.Ī machinist achieves that geometric precision by using tools that come with a feature called the chamfer, which cuts a 90-degree angle or edge to make it more symmetrical. Cutting a tap means using tools that remove material from the tapped hole, according to North American Tool. When machinists need to create internal threads, they opt for cutting taps. Cutting taps and forming taps produce threads that are interchangeable and gauge identically, but those are the only similarities between the two tapping styles. ![]()
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