公制外螺纹（6g）常用规格极限尺寸表（粗牙）ttttttt

　　公称直径×螺距 精度t 大径tt 中径tt 小径t 螺胚直径t

　　最大t最小t 最大t最小t 最大t最小t 最大

　　M3×0.5t6gt2.980 t2.874 t2.655 t2.580 t2.439 t2.60 t2.63

　　M4×0.7tt3.978 t3.838 t3.523 t3.433 t3.220 t3.47 t3.50

　　M5×0.8tt4.976 t4.826 t4.456 t4.361 t4.110 t4.40 t4.43

　　M6×1tt5.974 t5.794 t5.324 t5.212 t4.891 t5.26 t5.29

　　M8×1.25tt7.972 t7.760 t7.160 t7.042 t6.619 t7.10 t7.14

　　M10×1.5tt9.968 t9.732 t8.994 t8.862 t8.344 t8.92 t8.96

　　M12×1.75tt11.966 t11.701 t10.829 t10.679 t10.072 t10.75 t10.79

　　M14×2tt13.962 t13.682 t12.663 t12.503 t11.797 t12.57 t12.62

　　M16×2tt15.962 t15.682 t14.663 t14.503 t13.797 t14.57 t14.62

　　M18×2.5tt17.958 t17.623 t16.334 t16.164 t15.252 t16.24 t16.29

　　M20×2.5tt19.958 t19.623 t18.334 t18.164 t17.252 t18.24 t18.29

　　M22×2.5tt21.958 t21.623 t20.334 t20.164 t19.252 t20.24 t20.29

　　M24×3tt23.952 t23.577 t22.003 t21.803 t20.704 t21.89 t21.95

　　M27×3tt26.952 t26.577 t25.003 t24.803 t23.704 t24.89 t24.95

　　1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。

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