This recommendation chart is a starting point Screw/thread size, major and minor diameter, drill size, decimal equivalent The tap hole size may need to be adjusted based on your specific tolerance, material, and hardness.
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Forming taps cold form threads in ductile materials such as brass, copper, aluminum and leaded steels as well as series 301 to 347 stainless steels
Thread size can be maintained closely since taps have no cutting edges.
Explore precision forming tap drill sizes for reliable threading solutions Jarvis offers charts and tools for perfect thread formation every time. Calculations are done according to roll form tap drill charts which are given in the machinery's handbook Desired thread size and % of full thread are input parameters for the calculator.
Use this chart from kodiak cutting tools for reference with thread forming tap drill sizes Thread forming taps can be very effective when used properly. Tap drill size calculator for inch and metric threads (for cutting and forming taps) Plus formulas and charts for tap drill size.
