Newman Tool's handy hint. For Metric sizes only. Diameter of thread minus the pitch equals the tap drill size. eg. M6 x 1 6 - 1 = 5mm and you thought metric was difficult ;-) thanks to Jay Steinbuchel of Barksdale Control Products for the following: This works for all 75% threads, not just metric. For example, the tap drill for 3/8-16 is 5/16. The pitch is 1/16". (1 / threads per inch = inches per thread) 3/8 - 1/16 = 5/16. For other sizes that don't work out so nicely, just use the closest drill size.
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AuthorMuthukrishnan Kumarasamy Quote of the dayArchives
December 2013
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