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It’s just the depth of your thread divided because of the square root of the amount of passes. Bit of a mouthful.You only require operate 1 go such as this. It may scratch the initial pass. Put your pace back up so you received’t see it. (It can be our top secret)나사가 한바퀴 돌았을때 이동한 거리, 통상적으로 나사는 한