部分螺纹对照

部分米制普通螺纹、统一螺纹（美制）、惠氏螺纹（英制）对照米制螺纹（60°）统一螺纹（美制螺纹）（60°）惠氏螺纹（英制螺纹）（55°）粗牙细牙UNC(粗牙)UNF(细牙)BSW(粗牙)BSF(细牙)大径螺距大径螺距大径英寸每英寸牙数大径英寸每英寸牙数大径英寸每英寸牙数大径英寸每英寸牙数mmmmmmmmmm螺距mmmm螺距mmmm螺距mmmm螺距mm30.530.35No.540No.5441/8"403.1750.6353.1750.57733.1750.63540.740.5No.832No.8364.16560.79384.16560.70563/16"243/16"324.76251.05834.76250.7938No.1024No.10324.82601.05834.82600.793850.850.56160.51/4"201/4"281/4"201/4"266.351.276.350.90716.351.276.350.97695/16"185/16"245/16"185/16"227.93751.41117.93751.05837.93751.41117.93751.154581.25813/8"163/8"243/8"163/8"209.5251.58759.5251.05839.5251.58759.5251.27101.51017/16"147/16"207/16"147/16"1811.11251.814311.11251.2711.11251.814311.11251.41121.75121.51211/2"131/2"201/2"121/2"1612.71.953812.71.2712.72.116712.71.59142141.59/16"129/16"189/16"129/16"1614.28752.116714.28751.411114.292.116714.28751.58755/8"115/8"185/8"115/8"1415.8752.309115.8751.411115.8752.309115.8751.8143162161.5182.51823/4"103/4"163/4"103/4"1219.052.5419.051.587519.052.5419.052.1167202.5202201.5222.52227/8"97/8"147/8"97/8"1122.2252.822222.2251.814322.2252.822222.2252.3091243242241.51"81"121"81"1025.43.175025.42.116725.43.17525.42.54标记示例：121.75121.51/2"131/2"201/2"121/2"16M12-xxM12×1.5-xx1/2-13UNC-xx1/2-20UNF-xx1/2-12BSW1/2-16BSF注：标记中米制后xx为精度等级；美制后xx为精度(3、2或1)和内外螺纹代号（B或A）；英制也有相应要求