螺纹钻底孔用钻头直径尺寸表.doc

精品文档表一: 公制螺纹钻底孔用钻头直径尺寸表表二:圆柱管螺纹底孔钻头直径尺寸表（G）表四:60度圆锥螺纹底孔钻头直径尺寸表（Z或NPT）dtdzdtdzdtdzdndzdndz1粗0.250.7518粗2.515.436粗431.81/8288.81/16276.14细0.20.8细215.9细332.91/41911.71/8278.482粗0.41.61.516.5233.93/81915.21/41811细0.251.751171.534.51/21418.93/81814.423粗0.52.520粗2.517.439粗434.85/81420.81/21417.81细0.352.65细217.9细335.93/41424.33/41423.134粗0.73.31.518.5236.97/81428.1111+1/229.06细0.53.51191.537.511130.51+1/411+1/237.785粗0.84.222粗2.519.442粗4.537.31+1/81135.21+1/211+1/243.85细0.54.5细219.9细437.81+1/41139.2211+1/255.876粗151.520.5338.91+3/81141.6表五:英制螺纹底孔钻头尺寸表细0.755.2121239.91+1/21145.1dndz8粗1.256.724粗320.91.540.51+3/41151铸铁.青铜钢.黄铜细17细221.945粗4.540.3211573/16243.73.70.757.21.522.5细440.8表三:55度圆锥螺纹底孔钻头尺寸表（ZG或RC）1/4205.05.110粗1.58.5123341.95/16186.46.5细1.258.727粗323.9242.93/8167.87.919细224.91.543.57/16149.19.30.759.21.525.548粗542.71/21210.410.512粗1.7510.2126细443.8dndz9/16121212.1细1.510.530粗3.526.3344.91/8288.275/81113.313.51.2510.7细326.9245.91/41911.073/41016.316.4111227.91.546.53/81914.587/8919.119.314粗211.91.528.552粗546.71/21418.161821.922细1.512.5129细447.83/41423.521+1/8724.624.71.2512.733粗3.529.3348.911129.61+1/4727.827.9113细329.9249.91+1/41138.141+1/2633.433.516粗213.9230.91.550.51+1/21143.971+5/8535.735.8细1.514.51.531.521155.661+3/4538.9391152+1/21171.071+7/84+1/241.441.524+1/244.644.7注：1、d为公称直径，表一中单位为mm，表二、三、四、五中为英寸2、t为螺距,单位mm.3、n为每英寸牙数4、