米制螺纹常用参数及规定.doc

二、米制螺纹常用参数及规定2.1米制螺纹的基本尺寸：（GB/T 196-1981）D2=d2=D-3H/4=D-0.6459P D1=d1=D-5H/4=D-1.0825P米制螺纹的基本尺寸： mm公称直径（大径）D,d螺距P中径D2,d2小径D1,d1公称直径（大径）D,d螺距P中径D2,d2小径D1,d110.20.8700.783100.759.5139.1880.250.8380.72919.3508.9171.10.20.9700.8831.259.1888.6470.250.9380.8291.59.0268.3761.20.21.0700.983110.7510.51310.1880.251.0380.929110.3509.9171.40.21.2701.1831.510.0269.3760.31.2051.07512111.35010.9171.60.21.4701.3831.2511.18810.6470.351.3731.2211.511.02610.3761.80.21.6701.5831.7510.86310.1060.351.5731.42114113.35012.91720.251.8381.7291.513.02612.3760.41.7401.567212.70111.8352.20.252.0381.92915114.35013.9170.451.9081.7131.514.02613.3762.50.352.2732.12116115.35014.9170.452.2082.0131.515.02614.37630.352.7732.621214.70113.8350.52.6752.45917116.35015.9173.50.353.2733.1211.516.02615.3760.63.1102.85018117.35016.91740.53.6753.4591.517.02616.3760.73.5453.242216.70115.8354.50.54.1753.9592.516.37615.2940.754.0133.68820119.35018.91750.54.6754.4591.519.02618.3760.84.4804.134218.70117.8355.50.55.1754.9592.518.37617.29460.755.5135.18822121.35020.91715.3504.9171.521.02620.37670.756.5136.188220.70119.83516.3505.9172.520.37619.29480.757.5137.18824123.35022.91717.3506.9171.523.02622.3761.257.1886.647222.70121.83590.758.5138.188322.05120.75218.3507.91725124.35023.9171.258.1887.6471.524.02623.3762.2米制普通螺纹的标准系列 米制普通螺纹的标准系列 （mm）公称直径D、d螺距P第一系列第二系列第三系列粗牙细牙321.51.2510.750.50.350.250.210.250.21.21.11.40.250.20.250.20.30.21.621.80.350.20.350.20.40.252.532.20.450.251.450.350.50.3543.54.50.60.350.70.50.750.5565.50.80.50.510.7587910.751.2510.751.2510.751012111.51.2510.751.510.751.751.51.25116141521.51.2511.5121.512018171.512.521.512.521.512422252.521.51321.5121.5127262831.5321.51321.513033323.5（3）21.5121.53.5（3）21.5363935381.50.24321.50.21.50.24321.50.2注：1.优选第一系列直径，其次选择第二系列直径，最后选择第三系列直径2.尽可能避免