螺纹钻底孔用钻直径尺寸表

1、螺纹钻底孔用钻直径尺寸表作者:日期:英制螺纹钻底孔用钻头直径尺寸表计算公式：螺纹公称直径铸铁与青铜钢与黄铜3/16 5/8 inD o=25(d-1/n)二 D o=25(d-1/n)+0.13/41 ? inD o=25(d-1/n)D o=25(d-1/ n)+0.2D 0攻螺纹前钻头直径（mm） d螺纹公称直径（in）n每英寸牙数公称直径 （英寸）每英寸 牙数钻头直径 （毫米）公称直径 （英寸）每英寸牙数钻头直径 （毫米）铸铁、青铜钢、黄铜铸铁、青铜钢、黄铜3/16243.73.77/8919.119.31/4205.05.11821.9225/16186.46.51 1/8724.62

2、4.73/8167.87.91 1/4727.827.97/16149.19.31 1/2633.433.51/21210.410.51 5/8535.735.89/16121212.11 3/4538.9395/81113.313.51 7/84 1/241.441.53/41016.316.424 1/244.644.7圆柱管螺纹钻底孔用钻头直径尺寸表公称直径每英寸钻头直径公称直径每英寸钻头直径（英寸）牙数（毫米）（英寸）牙数（毫米）1/8288.811130.51/41911.71 1/81135.23/81915.21 1/41139.21/21418.91 3/81141.65/81

3、420.81 1/21145.13/41424.31 3/411517/81428.121157圆锥管螺纹钻底孔用钻头直径尺寸表55°圆锥管螺纹60°圆锥管螺纹公称直径 （英寸）每英寸牙数钻头直径 （毫米）公称直径 （英寸）每英寸牙数钻头直径 （毫米）1/8288.41/8278.61/41911.21/41811.13/81914.73/81814.51/21418.3?1417.93/41423.63/41423.211129.7111 ?29.21 1/41138.31 1/411 ?37.91 1/21144.11 ?11 ?43.921155.8211 ?56公制

4、螺纹钻底孔用钻头直径尺寸表（毫米）公称直径d螺距t钻头直径dz公称直径d螺距t钻头直径dz粗0.250.75粗2.519.5122219.9细0.20.8细1.520.5121粗0.41.6粗320.9224221.9细0.251.75细1.522.5123粗0.52.5粗324224.9327细0.352.65细1.525.5126粗0.73.3粗3.526.5326.9430227.9细0.53.5细1.528.5129粗0.84.2粗3.529.5533329.9细0.54.5细230.91.531.5粗15粗432636332.9细0.755.2细233.91.534.5粗1.256.

5、7粗43581739335.9细细236.90.757.21.537.5粗1.58.5粗4.537.3437.81.258.71042338.9细19细239.90.759.21.540.5粗1.7510.2粗4.540.5440.81.510.51245341.9细1.2510.7细242.91111.543.5粗211.9粗542.7A C443.8141.512.548344.9细1.2512.7细245.91131.546.5粗214粗547447.8161.514.552348.9细115细249.91.550.5粗2.515.4215.918细1.516.5117粗2.517.420217.9细1.518.5119（二）普通螺纹宜径与螺距条列蝶红轴銭打二臂 /J = 0541265877 P;-vA/ = 0324759526/J; o-T/ = 0.21650635化 斗V = 0J 08253175P表4 _ 1 - I普通螺纹基木芳型及尺寸计算一内螺纹大径d一外螺纹大径i）2-内螺纹中径 込-外螺纹中径/）-内螺纹小径禺-外螺纹小径 厂-螺距原始三角形鬲度旧机械制图标准的管螺纹代号与现行管螺纹代号的对应关系序号种类现行特征代号含义旧机械制图标准155°密封管螺纹Rc圆锥内螺纹ZGRp圆柱内螺纹