![]() ![]() ![]() The drill chart I used suggests the drills in the column titled Drill. Below is a chart I created that shows a range of some popular fine and coarse inch cut tap specifications. This might be why you have reoccurring issues in certain thread sizes you tap. H is equal to insert nominal length +1 Pitch. The effective thread percentage of a roll form tap is 65. Shown below (Dimension H) are the MINIMUM for countersunk holes and insert set-down of 1-1/2 ![]()
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