常用规格（公制）
	M1.2＊0.25 M2.5＊0.45 M6＊0.75 M10＊0.75
	M1.4＊0.3 M2.6＊0.45 M6＊1 M10＊1
	M1.6＊0.35 M3＊0.5 M7＊0.75 M10＊1.25
	M1.7＊0.25 M3＊0.6 M7＊1 M10＊1.5
	M1.7＊0.35 M3.5＊0.6 M8＊0.75 M11＊1
	M1.8＊0.35 M4＊0.5 M8＊1 M11＊1.5
	M2＊0.4 M4＊0.7 M8＊1.25 12＊1
	M2.2＊0.45 M5＊0.5 M9＊1 M12＊1.25
	M2.3＊0.45 M5＊0.8 M9＊1.25 M12＊1.5