![]() ![]() But WAIT !!! Did you calculate the TRUE HOLE SIZE by the suggested effective diameter percentage? Did you assume the recommended drill size will provide the correct percentage? This might be why you have reoccurring issues in certain thread sizes you tap. Formulas produce threads depending on the workpiece material. For example, a 2B tap must be associated with a 2A screw and a 2B nut. Tap Drill Size Tap Basic Major Diameter - (Pitch 2) Drill Size Major Diameter - (0.0068 x desired of thread) Threads per Inch Drill Size (mm) Major Diameter - 0.0068 x desired of thread x pitch (mm) 147.06. So you pull out your favorite drill company’s decimal equivalent/metric conversion/ tap drill chart and by their guidance, you use the tap drill they recommend for the thread you are making. Calculating Tap Drill Sizes for Forming Taps. Other types of taps, such as hand or fractional. As the sizes progress up the tap scale, it increases in size by. 0130 inches, making its outside diameter. It has an outside diameter of 0860 inches. The effective thread percentage of a roll form tap is 65%. The sizes of a 2B and a 3B tap are different.
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