規格, 螺距, 根徑/外徑, 內徑/根徑. M1*0.25, 0.25, 1, 0.729 ... M8*1.25, 1.25, 8, 6.647. M10*1.5, 1.5, 10, 8.376. M12*1.75, 1.75, 12, 10.106.
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