![]() * Values are calculated for Length of engagement of 5xPitch. NPT (National Pipe Thread) Taps Acme Taps British Standard Taps Extension Taps NPS (National Pipe Straight) Taps Garden Hose Taps Nut Taps Spiral Pointed Taps Tap Wrenches XLT Tapper Dies. Contact us for additional information on special tap drill sizes. ![]() * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.972 - 0.99 24.689 - 25.146 D 2 Pitch Diameter 1.0079 - 1.0149 25.601 - 25.778 D Major Diameter 1.0620 (Min) 26.975 (Min) α Varation of 30° anngle (+/-) 0.9167 (Ref) 23.284 (Ref) P Varation of Pitch (+/-) 0.002 (Ref) 0.051 (Ref) Use Thread Check's tap drill chart to determine the right size tap drill you need. A good way to decide on what diameter drill to choose is to use a tap drill. This is usually referred to as a tapping drill for the size of the thread that needs to be produced. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 1.0506 - 1.062 26.685 - 26.975 d 2 Pitch Diameter 1.0039 - 1.0079 25.499 - 25.601 d 3 Minor Diameter The most common way to produce an internal female thread is to drill a hole smaller than the major diameter and then use a tap to produce the thread. ![]() It is usually measured in millimeters (mm) or inches. Tap Chart Form Threads - provides tap sizes and drill sizes for form threads. ![]() For calculations of different engagement length use the Thread Calculator Tap drill size is the diameter of the hole used to create new threads in a material. * Values are calculated for Length of engagement of 5xPitch. * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0016 (Ref) 0.041 (Ref) d Major Diameter 1.049 - 1.0604 26.645 - 26.934 d 2 Pitch Diameter 1.0009 - 1.0063 25.423 - 25.56 d 3 Minor Diameter 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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