Vanish thread is also referred to as a partial thread, washout thread, or thread runout, and is that portion of the incomplete thread which is not fully formed at root or at crest and root.

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Quizplus · Accepted Answer

Vanish thread is indeed referred to as a partial thread, washout thread, or thread runout, and is that portion of the incomplete thread which is not fully formed at root or at crest and root.

Vanish Thread Is Also Referred to as a Partial Thread