What size of hole should be bored before cutting a 7/8 in. internal thread having 9 TPI and 12 mm. internal thread having 1.75 no. of pitch

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Metrology of Screw Threads

Screw threads are a series of ridges having the profile of a helix. This helix profile runs continuously along the length of a uniform solid or a hollow bar of a circular cross-section at periodic intervals. These helix ridges are also formed over a conical bar. These continuous helical ridges are termed threads.