英制螺纹标准

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1、英制螺纹标准规格表55°(非密封)(GB/T7307-2001)尺寸代号、每英寸牙数、螺距、螺纹直径（in英寸）代号（n）牙数（p）螺距大径Dd小径D1d1G1/16"280.9077.7236.561G1/8"280.9079.7288.566G1/4"191.33713.15711.445G3/8"191.33716.66214.95G1/2"141.81420.95518.631G5/8"141.81422.91120.587G3/4"141.81426.44124.117G7/8"141.81430.2

2、0127.877G1"112.30933.24930.291G1-1/8"112.30937.89734.939G1-1/4"112.30941.9138.952G1-1/2"112.30947.80344.845G1-3/4"112.30953.74650.788G2"112.30959.61456.656G2-1/4"112.30965.7162.752G2-1/2"112.30975.18472.226G2-3/4"112.30981.53478.578G3"112.30987.88484.926G3-1

3、/2"112.309100.3397.372G4"112.309113.03110.072G5"112.309138.43135.472G6"112.309163.83160.872注：1英寸（in）=25.4mm英制螺纹标准规格表55°(密封用圆锥管螺纹)(GB/T7306.1、7306.2-2000)尺寸代号、每英寸牙数、螺距、螺纹直径（in英寸）代号（n）牙数（p）螺距基准平面上的基本直径（mm）牙高h（mm）装备余量（mm）外螺纹长度（mm）大径Dd小径D1d1有效长度基准距离ZG1/16"280.90

4、77.7236.5610.5812.56.54.0ZG1/8"280.9079.7288.566ZG1/4"191.33713.15711.4450.8563.79.76.0ZG3/8"191.33716.66214.9510.16.4ZG1/2"141.81420.95518.6311.1625.013.28.2ZG3/4"141.81426.44124.11714.59.5ZG1"112.30933.24930.2911.4796.416.810.4ZG1-1/4"112.30941.9138.95219.

5、112.7ZG1-1/2"112.30947.80344.84519.112.7ZG2"112.30959.61456.6567.523.415.9ZG2-1/2"112.30975.18472.2269.226.717.5ZG3"112.30987.88484.92629.820.6ZG4"112.309113.03110.07210.435.825.4ZG5"112.309138.43135.47211.540.128.6ZG6"112.309163.83160.87240.128.6注：1英寸（in）=2

6、5.4mm