![]() H is equal to insert nominal length +1 Pitch. Thread series: Thread series is a standard based upon the number of threads. Basic Major Diameter of Tap 2.0000 0. threads per inch hole sizes required for: tap drill size (65 thread) h number per class of fit stock 'h number nc unc nf unf 75 thread 65 thread 55 thread 2b 3b 2 000 120. This thread form is characterized by a 60 degree thread angle and a flat crest and rounded root. Tap Drill Sizes and Pitch Diameter Limits Vol 2 Tapping Guide Example: Determine Drill Size for 212N Tap,70 Full Thread. The standard thread form for inch unit threads in U.S. ![]() Shown below (Dimension H) are the MINIMUM for countersunk holes and insert set-down of 1-1/2 Thread form is a classification based upon the cross-sectional profile of the thread. ![]()
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