1、螺纹加工中挤压螺纹前螺纹底孔尺寸螺纹加工 牙型高度（）100 95 90 85 80 75 70 65螺纹代号底孔直径M20.4 1.77 1.78 1.8 1.81 1.82 1.83 1.84 1.85M2.50.45 2.25 2.26 2.27 2.28 2.30 2.31 2.32 2.33M30.35 2.8 2.81 2.82 2.83 2.84 2.85 2.86 2.87M30.5 2.72 2.73 2.75 2.76 2.77 2.79 2.80 2.82M40.5 3.72 3.73 3.75 3.76 3.77 3.79 3.80 3.82M40.7 3.60 3.6
2、2 3.64 3.66 3.68 3.70 3.72 3.74M50.5 4.72 5.73 4.75 4.78 4.77 4.79 4.80 4.82M50.8 4.55 4.57 4.59 4.61 4.64 4.66 4.68 4.70M60.75 5.57 5.59 5.62 5.64 5.66 5.68 5.70 5.72M61 5.43 5.46 5.49 5.52 5.55 5.57 5.60 5.63M81 7.43 7.46 7.49 7.52 7.55 7.57 7.60 7.63M81.25 7.29 7.33 7.36 7.49 7.43 7.47 7.50 7.54M
3、100.75 9.57 9.59 9.62 9.64 9.66 9.68 9.70 9.72M101 9.43 9.46 9.49 9.52 9.55 9.57 9.60 9.63M101.25 9.29 9.33 9.36 9.40 9.43 9.47 9.50 9.54M101.5 9.15 9.19 9.23 9.28 9.32 9.36 9.40 9.45M121 11.43 11.46 11.49 11.52 11.55 11.57 11.60 11.63M121.25 11.29 11.33 11.36 11.40 11.43 11.47 11.50 11.54M121.5 11.15 11.19 11.23 11.28 11.32 11.36 11.40 11.45M121.75 11.01 11.06 11.11 11.16 11.20 11.25 11.30 11.35
