![]() ![]() Major Diameter Minor Diameter Drill Size. Straight Hole many applications for tapered pipe threads may use a straight hole. eg for 3/4.10 UNC pitch = 0.1, diameter = 0.75, tapping drill = 0.65 = 16.5mm. Tap Drill Chart: Tapped Hole Stainless Steel, Steels, Iron Microform Precision. Cutting oils are generally preferred because of their lubricity compared to water soluble coolants Calculating Tap Drill Sizes for Forming Taps Tap Drill Size Tap Basic Major Diameter - (Pitch 2) Drill Size Major Diameter - (0. Tapered holes require the most torque and HP for tapping. eg for an M5x0.75 thread the tapping drill is 5-0.75mm = 4.25mm.įor Imperial (inch) threads the tapping drill size is calculated in the same way, diameter minus pitch. As a rule of thumb, for Metric threads, the tapping drill can be calculated by subtracting the pitch from the diameter of the thread. ![]()
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