規格, 螺距, 根徑/外徑, 內徑/根徑. M1*0.25, 0.25, 1, 0.729 ... M14*2.0, 2, 14, 11.835. M16*2.0, 2, 16, 13.835. M18*2.5, 2.5, 18, 15.294.
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