A 1/4-20 go plug starts by hand and locks after two turns. The no-go does not enter. The operator wants to tap deeper. The hole is a through hole and the tap was a spiral point.
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A plug that starts and locks is often a bell-mouth or a chip in the first threads, or a tap that cut big at the start and small at the exit. Clean the hole and try the plug again before a deeper tap. Deeper does not fix a drunk first thread.
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If a cleaned hole still locks at two turns, the pitch diameter is tight partway through. That is a tap or a misalignment, not a missing turn.
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No-go staying out is good news. Do not 'fix' a go that binds by cutting until the no-go also goes.
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Questions and answers were written on this account when they were published.
