Which step is essential before using an inch tap to obtain the correct internal thread size?
Drill a hole of correct size for the tap
A tap cuts an internal thread only into an existing hole; the hole diameter must equal the tapping-drill size, roughly the thread's root diameter, so enough material is left for full threads.
This tapping-size (tap-drill) hole must be drilled first; if the hole is wrong the threads come out shallow or oversize and will not fit the mating screw.
Centre-punching and lubrication help the work but do not set the thread size, and a die cuts external threads, so none of these fixes the internal size.
Hence, the answer is Drill a hole of correct size for the tap.
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