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螺纹规格螺距螺纹规格螺距螺纹规格螺距M30.5M182.5M394M40.7M202.5M424.5M50.8M222.5M454.5M61M243M485M81.25M273M525M101.5M303.5M565.5M121.75M333.5M605.5M142M364M646M162公制螺纹（MM牙）牙深=0.6495*牙距（牙角60º）内孔牙径=公称直径-1.0825PM20*2.5-6H/7g（右手）-（单头螺纹）-（公制粗牙）公称直径20mm，牙距2.5mm内螺纹配合等级6H外螺纹配合等级7g螺纹螺距对照表