英制和公制螺牙的一般叫法

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1、英制螺牙的一般叫法在英制螺牙中，1英寸=8英分，所以在日常生活中，有人给你说“几分”的牙，指的就是英制的牙，其中的转换关系为1/4’’=8*1/4=2分，1/2’’=8*1/2=4分，1-1/2’’=8*1-1/2=1英寸4英分（我们就叫1寸4的牙，或者叫一又二分之一的牙），日常计算中，一英寸=25.4mm，附英制螺牙表格：公制螺牙标准尺寸我们一般用的公制螺牙具体型号为公称直径*牙距，一般在生活中我们只报外径就可以比如，M6*1的螺丝，我们直接说6#的螺丝就行了，牙距一般不报常用的公制螺牙表格公制外螺纹（6g）常用规格极限尺寸表（粗牙）公称直径×螺距螺纹精度等级大径中径小径螺

2、胚直径最大最小最大最小最大最小最大M3×0.56g2.9802.8742.6552.5802.4392.602.63M4×0.73.9783.8383.5233.4333.2203.473.50M5×0.84.9764.8264.4564.3614.1104.404.43M6×15.9745.7945.3245.2124.8915.265.29M8×1.257.9727.7607.1607.0426.6197.107.14M10×1.59.9689.7328.9948.8628.3448.928.96M12×1.7511.96611.70110.82910.67910.072

3、10.7510.79M14×213.96213.68212.66312.50311.79712.5712.62M16×215.96215.68214.66314.50313.79714.5714.62M18×2.517.95817.62316.33416.16415.25216.2416.29M20×2.519.95819.62318.33418.16417.25218.2418.29M22×2.521.95821.62320.33420.16419.25220.2420.29M24×323.95223.57722.00321.80320.70421.8921.95M27×3

4、26.95226.57725.00324.80323.70424.8924.95公制外螺纹（6g）常用规格极限尺寸表（细牙）公称直径×螺距螺纹精度等级大径中径小径螺胚直径最大最小最大最小最大最小最大M3X0.356g2.9812.8962.7542.6872.6022.712.73M4X0.53.9803.8743.6553.5803.4393.603.63M5×0.54.9804.8744.6554.5804.4394.604.63M6×0.755.9785.8385.4915.3915.1665.425.46M8×0.757.9787.8387.4917.3917.166

5、7.427.46M8×17.9747.7947.3247.2126.8917.267.29M10×0.759.9789.8389.4919.3919.1669.429.46M10×19.9749.7949.3249.2128.8919.269.29M10×1.259.9729.7609.1609.0428.6199.089.12M12×111.97411.79411.32411.20610.89111.2511.29M12×1.2511.97211.76011.16011.02810.61911.0811.12M12×1.511.96811.73210.99410.85410

6、.34210.9110.95M14×113.97413.79413.32413.20612.89113.2513.29M14×1.513.96813.73212.99412.85412.34412.9112.95M16×115.97415.79415.32415.20614.89115.2515.29M16×1.515.96815.73214.99414.85414.34414.9014.95M18×117.97417.79417.32417.20616.89117.2517.29M18×1.517.96817.73216.99416.85416.33416.9016.95M

7、18×217.96217.68216.66316.50315.79716.5816.62M20×119.97419.79419.32419.20618.89119.2419.29M20×1.519.96819.73218.99418.85418.34418.9018.95M20×219.96219.68218.66318.50317.79718.5718.62M22×121.97421.79421.32421.20620.89121.2421.29M22×1.521.96821.73220.99420.