螺纹钻底孔⽤钻直径尺⼨表螺纹钻底孔⽤钻直径尺⼨表————————————————————————————————作者：————————————————————————————————⽇期：2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 in D 0=25(d-1/n) D 0=25(d-1/n)+0.13/4 ~1 ?in D 0=25(d-1/n) D 0=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3/16 24 3.7 3.7 7/8 9 19.1 19.3 1/4 20 5.0 5.1 1 8 21.9 22 5/16 18 6.4 6.5 1 1/8 7 24.6 24.7 3/8 16 7.8 7.9 1 1/4 7 27.8 27.9 7/16 14 9.1 9.3 1 1/2 6 33.4 33.5 1/2 12 10.4 10.5 1 5/8 5 35.7 35.8 9/16 12 12 12.1 1 3/4 5 38.9 39 5/8 11 13.3 13.5 1 7/8 4 1/2 41.4 41.5 3/4 10 16.3 16.4 2 4 1/2 44.6 44.7圆柱管螺纹钻底孔⽤钻头直径尺⼨表公称直径(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3/4 14 24.3 1 3/4 11 51 7/8 14 28.1 2 11 57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)1/8 28 8.4 1/8 27 8.6 1/4 19 11.2 1/4 18 11.1 3/8 19 14.7 3/8 18 14.5 1/2 14 18.3 ?14 17.9 3/4 14 23.6 3/4 14 23.2 1 11 29.7 1 11 ?29.2 1 1/4 11 38.3 1 1/4 11 ?37.9公制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dz1 粗0.25 0.7522粗 2.5 19.5 细0.2 0.8 细21.5119.92 粗0.4 1.624粗 3 20.9 细0.25 1.75 细21.5121.922.5233 粗0.5 2.527粗 3 24 细0.35 2.65 细21.5124.925.5264 粗0.7 3.330粗 3.5 26.5 细0.5 3.5 细321.5126.927.928.5295 粗0.8 4.233粗 3.5 29.5 细0.5 4.5 细36 粗 1 536粗 4 32 细0.75 5.2 细321.532.933.934.58 粗 1.25 6.739粗 4 35 细10.7577.2细321.535.936.937.510 粗 1.5 8.542粗 4.5 37.3 细1.2510.758.721.537.838.939.940.512 粗 1.75 10.2 45粗 4.5 40.5 细1.51.25110.510.711细4321.540.841.942.943.514 粗 2 11.9 48粗 5 42.7 细1.51.251321.543.844.945.946.516 粗 2 1452粗 5 47 细1.5114.515细4321.547.848.949.950.518 粗 2.5 15.4 细21.5115.916.51718.519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1 55°密封管螺纹Rc 圆锥内螺纹ZG Rp 圆柱内螺纹R1 与圆柱内螺纹（Rp）配合的圆锥外螺纹R2 与圆锥内螺纹（Rc）配合的圆锥外螺纹2 55°⾮密封管螺纹G G3 60°密封管螺纹NPT 圆锥管螺纹Z NPSC 圆柱内螺纹4 ⽶制锥螺纹ZM。
公制螺纹钻底孔用钻头直径尺寸表M1:粗扣螺距0.25＝Φ0.75 细扣螺距0.2＝Φ0.8M2:粗扣螺距0.4＝Φ1.6 细扣螺距0.25＝Φ1.8M3:粗扣螺距0.5＝Φ2.5 细扣螺距0.35＝Φ2.7M4:粗扣螺距0.7＝Φ3.3 细扣螺距0.5＝Φ3.5M5:粗扣螺距0.8＝Φ4.2 细扣螺距0.5＝Φ4.5M6:粗扣螺距1.0＝Φ5.0 细扣螺距0.75＝Φ5.2M8:粗扣螺距1.25＝Φ6.7 细扣螺距1.0 , 0.75＝Φ7,Φ7.2M10:粗扣螺距1.5＝Φ8.5 细扣螺距1.25 , 1.0 , 0.75＝Φ8.7,Φ9,Φ9.2M12:粗扣螺距1.75＝Φ10.2 细扣螺距1.5 , 1.25 , 1.0＝Φ10.5,Φ10.7,Φ11 M14:粗扣螺距2.0＝Φ11.9 细扣螺距1.5 , 1.25 , 1.0＝Φ12.5,Φ12.7,Φ13 M16:粗扣螺距2.0＝Φ14 细扣螺距1.5 , 1.0＝Φ14.5,Φ15M18:粗扣螺距2.5＝Φ15.4 细扣螺距2.0 ,1.5 ,1.0＝Φ15.9,Φ16.5,Φ17M20:粗扣螺距2.5＝Φ17.4 细扣螺距2.0 , 1.5 , 1.0＝Φ17.9,Φ18.5,Φ19M22:粗扣螺距2.5＝Φ19.5 细扣螺距2.0 , 1.5 , 1.0＝Φ19.9,Φ20.5,Φ21M24:粗扣螺距3.0＝Φ20.9 细扣螺距2.0 , 1.5 , 1.0＝Φ21.9,Φ22.5,Φ23生产中钻螺纹底孔公式：t＜1mm: Dz=d-tt＞1mm: Dz=d-(1.04~1.06)t式中 t 螺距（毫米）Dz 攻丝前钻头直径（毫米）d 螺纹公称直径（毫米）公制螺纹钻底孔用钻头直径尺寸表公称直径d 螺距t 钻头直径公称直径d 螺距t 公称直径dM1 粗 0.25 =0.75 M2 粗 0.4 =1.6细 0.2 =0.8 细 0.25 =1.75M3 粗 0.5 =2.5 M4 粗 0.7= 3.3细 0.35 =2.65 细 0.5 =3.5M5 粗 0.8 =4.2 M6 粗 1.0 =5.0细 0.5 =4.5 细 0.75 =5.2M8 粗 1.25 =6.7 M10 粗 1.5 =8.5细 1.0 =7.0 细 1.25 =8.7细 0.75 =7.2 细 1.0 =9.0细 0.75 =9.2M12 粗 1.75 =10.2 M14 粗 2.0 =11.9细 1.5 =10.5 细 1.5 =12.5细 1.25 =10.7 细 1.25 =12.7细 1.0 =11.0 细 1.0 =13.0M16 粗 2.0 =13.9 M18 粗 2.5 =15.4 细 1.5 =14.5 细 2.0 =15.9 细 1.0 =15.0 细 1.5 =16.5 细 1.0 =17.0M20 粗 2.5 =17.4 M22 粗 2.5 =19.4 细 2.0 =17.9 细 2.0 =19.9 细 1.5 =18.5 细 1.5 =20.5 细 1.0 =19.0 细 1.0 =21.0M24 粗 3.0 =20.9 M27 粗 3.0 =23.9 细 2.0 =21.9 细 2.0 =24.9 细 1.5 =22.5 细 1.5 =25.5 细 1.0 =23.0 细 1.0 =26.0M30 粗 3.5 =26.3 M33 粗 3.5 =29.3 细 3.0 =26.9 细 3.0 =29.9 细 2.0 =27.9 细 2.0 =30.9 细 1.5 =28.5 细 1.5 =31.5 细 1.0 =29.0M36 粗 4.0 =31.8 M39 粗 4.0 =34.8 细 3.0 =32.9 细 3.0 =35.9 细 2.0 =33.9 细 2.0 =36.9 细 1.5 =34.5 细 1.5 =37.5M42 粗 4.5 =37.3 M45 粗 4.5 =40.3 细 4.0 =37.8 细 4.0 =40.8 细 3.0 =38.9 细 3.0 =41.9 细 2.0 =39.9 细 2.0 =42.9 细 1.5 =40.5 细 1.5 =43.5M48 粗 5.0 =42.7 M52 粗 5.0 =46.7 细 4.0 =43.8 细 4.0 =47.8 细 3.0 =44.9 细 3.0 =48.9 细 2.0 =45.9 细 2.0 =49.9 细 1.5 =46.5 细 1.5 =50.5欢迎您的下载，资料仅供参考！致力为企业和个人提供合同协议，策划案计划书，学习资料等等打造全网一站式需求。
