篇一：螺纹孔底径尺寸表篇二：螺纹孔底径尺寸表
螺纹孔底孔尺寸推荐表公制螺纹标准尺寸M1*0.25M1*0.2M1.1*0.25M1.1*0.2M1.2*0.25M1.2*0.2M1.4*0.3M1.4*0.2M1.6*0.35D1min0.7290.7830.8290.8830.9290.9831.0751.183max0.7850.8210.8850.9210.9851.0211.1421.221底孔尺寸0.750.800.850.900.951.001.101.201.251.401.351.501.451.601.601.751.751.951.902.052.12.22.22.22.52.72.93.23.33.53.8标准尺寸M7*0.75※M7*0.5M8*1.25M8*1M8*0.75※M8*0.5M9*1.25M9*1M9*0.75M10*1.5M10*1.25M10*1M10*0.75※M10*0.5M11*1.5M11*1M11*0.75※M11*0.5M12*1.75M12*1.5M12*1.25M12*1※M12*0.5M14*2M14*1.5M14*1M15*1.5M15*1M16*2M16*1.5M16*1D1min6.1886.4596.6476.9177.1887.4597.6477.9178.1888.3768.6478.9179.1889.4599.3769.91710.18810.45910.10610.37610.64710.91711.45911.83512.37612.91713.37613.91713.83514.37614.917max6.3786.5996.9127.1537.3787.5997.9128.1538.3788.6768.9129.1539.3789.5999.67610.15310.37810.59910.44110.67610.91211.15311.59912.21012.67613.15313.67614.15314.21014.67615.153底孔尺寸6.36.56.87.07.37.57.88.08.38.58.89.09.39.59.510.010.310.510.310.510.811.011.512.012.513.013.514.014.014.515.0标准尺寸M20*2M20*1.5M20*1M22*2.5M22*2M22*1.5M22*1M24*3M24*2M24*1.5M24*1M25*2M25*1.5M25*1M26*1.5M27*3M27*2M27*1.5M27*1M28*2M28*1.5M28*1M30*3.5M30*3M30*2M30*1.5M30*1M32*2M32*1.5M33*3.5M33*3M33*2M33*1.5M35*1.5M36*4M36*3M36*2M36*1.5D1min17.83518.37618.91719.29419.83520.37620.91720.75221.83522.37622.91722.83523.37623.91724.37623.75224.83525.37625.91725.83526.37626.91726.21126.75227.83528.37628.91729.83530.37629.21129.752max18.21018.67619.15319.74420.21020.67621.15321.25222.21022.67623.15323.21023.67624.15324.67624.25225.21025.67626.15326.21026.67627.15326.77127.25228.21028.67629.15330.21030.67629.77130.252底孔尺寸18.018.519.019.520.020.521.021.022.022.523.023.023.524.024.524.025.025.526.026.026.527.026.527.028.028.529.030.030.529.530.031.031.533.532.033.034.034.5标准尺寸M38*1.5M39*4M39*3M39*2M39*1.5M40*3M40*2M40*1.5M42*4.5M42*4M42*3M42*2M42*1.5M45*4.5M45*4M45*3M45*2M45*1.5M48*5M48*4M48*3M48*2M48*1.5M50*3M50*2M50*1.5D1min36.37634.67035.75236.83537.37636.75237.83538.37637.12937.67038.75239.83540.37640.12940.67041.75242.83543.37642.58743.67044.75245.83546.37646.75247.83548.376max36.67635.27036.25237.21037.67637.25238.21038.67637.79938.27039.25240.21040.67640.79941.27042.25243.21043.67643.29744.27045.25246.21046.67647.25248.21048.676单位：mm底孔尺寸36.535.036.037.037.537.038.038.537.538.039.040.040.540.541.042.043.043.543.044.045.046.046.547.048.048.51.2211.321（1.383（1.42M1.6*0.21））※M1.7*0.351.3211.421※M1.7*0.2M1.8*0.35M1.8*0.2M2*0.4M2*0.251.4831.5211.4211.521（1.583(1.621)）1.5671.679（1.785）1.838（1.981.9792.0852.1382.2212.2382.3212.5992.7213.0103.2213.4223.5993.878（1.729）M2.2*0.451.713M2.2*0.25（1.929※M2.3*0.41.867※M2.3*0.252.029M2.5*0.452.013M2.5*0.35※M2.6*0.45※M2.6*0.35M3*0.5M3*0.35M3.5*0.6M3.5*0.35M4*0.7M4*0.5M4.5*0.752.1212.1132.2212.4592.6212.8503.1213.2423.4593.688M4.5*0.53.9594.0994.0M17*1.515.37615.67615.530.83531.210M5*0.84.1344.3344.2M17*115.91716.15316.031.37631.676M5*0.54.4594.5994.5M18*2.515.29415.74415.533.37633.676M6*14.9175.5135.0M18*215.83516.21016.031.67032.270M6*0.755.1885.3785.3M18*1.516.37616.67616.532.75233.252※M6*0.55.4595.5995.5M18*116.91717.15317.033.83534.210M7*15.9176.1536.0M20*2.517.29417.74417.534.37634.676上表所推荐的螺纹孔底孔尺寸都是针对JIS6H(等级2）公制螺纹。D1：JIS6H(class2)普通螺纹的最小尺寸。（）里的值是5H(class2)粗牙螺纹和4H.5H(class1)细牙螺纹的最小尺寸。※标记的尺寸已经从JIS中删除。
篇三：螺纹孔底径尺寸表
螺纹孔底尺寸表普通粗牙螺孔攻丝前钻孔尺寸公称尺寸M5×0.8M6×1M8×1.25M10×1.5M12×1.75M14×2M16×2M18×2.5M20×2.5M24×3M27×3M30×3.5M33×3.5M36×4M42×4.5M48×5M52×5M56×5.5M64×6M4×0.7普通细牙螺孔攻丝前钻孔尺寸中国(旧)ZG1/8″ZG1/4″ZG3/8″ZG1/2″ZG3/4″ZG1″ZG11/4″ZG11/2″ZG2″ZG21/2″ZG3″底孔d公称尺寸底孔d公称尺寸底孔d公称尺寸底孔d4.25.06.88.510.212.014.015.517.521.024.026.529.532.037.543.047.050.558.03.3M8×1M10×1M12×1M14×1M16×1M18×1M20×1M22×1M24×1M27×1M30×17.09.011.013.015.017.019.021.023.026.029.0M12×1.5M14×1.5M16×1.5M18×1.5M20×1.5M22×1.5M24×1.5M27×1.5M30×1.5M33×1.5M36×1.5M42×1.5M48×1.510.512.514.516.518.520.522.525.528.531.534.540.546.5M20×2M22×2M24×2M27×2M30×2M33×2M36×2M42×2M48×2M52×2M30×3M33×3M36×3M42×3M48×3M52×318.020.022.025.028.031.034.040.046.050.027.030.033.039.045.049.0圆锥管螺孔攻丝前钻孔尺寸公称尺寸中国(新)日本Rc1/8″PT1/8″Rc1/4″PT1/4″Rc3/8″PT3/8″Rc1/2″PT1/2″Rc3/4″PT3/4″Rc1″PT1″Rc11/4″PT11/4″Rc11/2″PT11/2″Rc2″PT2″Rc21/2″PT21/2″Rc3″PT3″锥管螺纹55度圆柱管螺孔攻丝前钻孔尺寸底孔d公称尺寸8.411.014.518.023.529.538.044.056.072.084.0G1/8″G1/4″G3/8″G1/2″G3/4″G1″G11/8″G11/4″G11/2″G13/4″G2″G11/4″G21/2″G23/4″G3″布锥管螺孔攻丝前钻孔尺寸公称尺寸底孔d底孔d中国(旧)中国(新)8.6Z1/8″NPT1/8″8.411.7Z1/4″NPT1/4″11.115.2Z3/8″NPT3/8″14.618.8Z1/2″NPT1/2″18.124.3Z3/4″NPT3/4″23.530.5Z1″NPT1″29.435.2Z11/4″NPT11/4″38.239.2Z11/2″NPT11/2″44.345.1Z2″NPT2″56.351锥管56.9螺纹60度62.9572.4578.885.2直管螺纹55度
篇四：螺纹孔底径尺寸表
英制螺纹尺寸表
英制尺寸
SM1/4″×2SM1/4″×24SM1/4″×2SM1/4″×4SM1/8″×4SM1/8″×44SM1/8″×4SM3/8″×2SM5/8″×2SM3/16″×24SM3/16″×32SM3/16″×2SM3/16″×4SM5/16″×1SM5/16″×24SM5/16″×2公称直径
Φ6.35Φ6.35Φ6。35Φ6。35Φ3.175Φ3。175Φ3.175Φ9。52Φ15.8Φ4.762Φ4.762Φ4。762Φ4。762Φ7.93Φ7.93Φ7。93底孔直径
Φ5.08Φ5.29Φ5.443Φ5。705Φ2.54Φ2。59Φ2.646Φ8.62Φ14.95Φ3.704Φ3.95Φ3。855Φ4。12Φ6。526Φ6.87Φ7。03英制尺寸
SM3/32″×56SM7/32″×22SM7/32″×32SM9/32″×2SM9/32″×2公称直径
Φ2.381Φ5。556Φ5.556Φ7.144Φ7。144Φ8。731Φ1.191Φ1。984Φ3。572Φ4。366Φ4.366Φ5。51Φ5.953Φ6.74Φ12。7Φ20。5底孔直径
Φ1.92Φ4。402Φ4。763Φ5。873Φ6。23Φ7.824Φ0。39Φ1。511Φ2.93Φ3。572Φ3.731Φ4。366Φ5.046Φ5.953Φ11。792Φ18。72SM11/32″×
SM3/64″×32SM5/64″×64SM9/64″×432SM11/64″×4SM11/64″×32SM13/32″×2SM15/64″×32SM17/64″×
SM1/2″×2SM1/2″×14英制内螺纹小径计算公式：螺纹直径×25。4—25。4/每英尺牙数
例：11/64″×40=11/64×25。4-25。4/40=4。3656—0。635≈3.73公制螺纹尺寸表
公制螺纹
M1粗牙螺距
0。25M20.4M2.50。45M30。5M3.50.6M4M4。5M50。0。750。M61M71Φ6M81。3Φ6.M101.5Φ8。5M121.75Φ10。2M142Φ11.M162Φ13。钻头直径
Φ0.75Φ1。6Φ2。05Φ2.5Φ2。Φ3。3Φ3。75Φ4。2Φ5细牙螺距
0。2钻头直径
0.0.30。40。50.50。0。751.250.751.51.251.51。251。51。9.210。510。1112.512。1314。51.2。3。54.55。27.28.公、英制转换
英寸值
公制值
英寸值
公制值
1/64″
0。391/24″
1.051/56″
0。4541/20″
1。21/48″
0。521/18″
1.4111/44″
0。571/16″
1.581/40″
0。6351/8″
3.1751/32″
0.7941/4″
6.351/28″
0.901/2″
12.7
篇五：螺纹孔底径尺寸表
螺纹底孔尺寸对照表序号12345678910111213141516171819202122232425262728293031323334353637螺纹种类及螺距M3x0.5M4x0.7M5x0.8M6x1M8x1.25M10x1.5M12x1.75M14x2M16x2M18x2.5M20x2.5M24x3M30x3.5M36x4M42x4.5M48x55/8-11UNC3/4-10UNC锥度管螺纹RC（PF)RC1/8(PT)RC1/4(PT)RC3/8(PT)RC1/2(PT)RC3/4(PT)RC1(PT)RC1+1/4(PT)RC1+1/2(PT)RC2(PT)RC2+1/2(PT)平行管螺纹G(PF)G1/8(PF)G1/4(PF)G3/8(PF)G1/2(PF)G5/8(PF)G3/4(PF)G1(PF)Φ8.6Φ11.5Φ8.8Φ11.87Φ15.38Φ19.1Φ21Φ24.6Φ30.9Φ8.2Φ10.9Φ14.4Φ18Φ23.5Φ29.5Φ38Φ44Φ55Φ71Φ8.5Φ11.1Φ14.6Φ18.5Φ23.8Φ29.9Φ38.5Φ44.6Φ55.6Φ71.6螺纹孔底直最大孔底直径径Φ2.5Φ2.59Φ3.3Φ4.2Φ5Φ6.8Φ8.5Φ10.2Φ12Φ14Φ15.5Φ17.5Φ21Φ26.5Φ32Φ37.5Φ43Φ13.6Φ16.6Φ3.42Φ4.33Φ5.2Φ6.9Φ8.6Φ10.4Φ12.1Φ14.2Φ15.7Φ17.7Φ21.2Φ26.7Φ32.2Φ37.743.2Φ13.8Φ16.8
篇六：螺纹孔底径尺寸表
底孔一般是指用丝锥攻内螺纹之前所预制的孔的直径，一般指加工件的内置圆孔，最底或最面上的圆形孔洞。
丝锥在攻螺纹的过程中，切削刃主要是切削金属，但还有挤压金属的作用，因而造成金属凸起并向牙尖流动的现象，所以攻螺纹前，钻削的孔径（即底孔）应大于螺纹内径。
底孔的直径可查手册或按下面的经验公式计算：脆性材料（铸铁、青铜等）：钻孔直径d0=d(螺纹外径)-1.1p（螺距）
塑性材料（钢、紫铜等）：钻孔直径d0=d(螺纹外径)-p（螺距）
公制粗螺紋
標準徑
2級牙鑽孔徑
規格
最大
最小
公制細螺紋
標準徑
2級牙鑽孔徑
最大
最小
規格
M1.0X0.25M1.1X0.25M1.2X0.250.750.7850.729M1.0X0.20.800.8210.7830.850.8850.829M1.1X0.20.900.9210.8830.950.9850.929M1.2X0.21.001.0210.983M1.4X0.31.101.1421.075M1.4X0.21.201.2211.183M1.6X0.35M1.7X0.31.251.3211.221M1.6X0.21.401.4211.3831.351.4211.321M1.7X0.21.451.5001.4605M1.8X0.351.45M2.0X0.41.60M2.2X0.451.75M2.3X0.41.90M2.5X0.452.10M2.6X0.452.20M3.0X0.52.50M3.0X0.62.401.5211.6791.8381.9792.1382.2382.5992.4401.4211.5671.7131.8672.0132.1132.4592.280M1.8X0.21.60M2.0X0.251.75M2.2X0.251.95M2.3X0.252.05M2.5X0.352.20M2.6X0.352.20M3.0X0.352.70M3.5X0.33.201.6211.7851.9852.0612.2212.2462.7213.2211.5831.7291.9292.0012.1212.1862.6213.1215M3.5X0.62.90M4.0X0.73.303.0103.4222.8503.242M4.0X0.53.50M4.5X0.54.003.5994.0993.4593.959M4.0X0.753.25M4.5X0.753.80M5.0X0.84.20M5.0X0.94.10M6.0X1.05.00M7.0X1.06.00M8.0X1.256.80M9.0X1.257.80M10X1.58.50M11X1.59.503.3263.8784.3344.1705.1536.1536.9127.9128.6769.6763.1063.6684.1343.9304.9175.9176.6477.6478.3769.376M5.0X0.54.50M5.5X0.55.00M6.0X0.755.30M6.0X0.55.50M7.0X0.756.30M7.0X0.56.50M8.0X1.07.00M8.0X0.757.30M8.0X0.57.50M9.0X1.08.004.5995.0995.3785.5506.3786.5507.1537.3787.5208.1534.4594.9595.1885.4006.1886.4006.9177.1887.4007.91M12X1.7510.3010.44112.2110.10611.83M9.0X0.75M10X1.28.308.3788.188M14X2.012.008.808.9128.647M16X2.0M18X2.5M20X2.5M22X2.5M24X3.0M27X3.0M30X3.514.0015.5017.5019.5021.0024.0026.5005514.2113.8305M10X1.09.009.1538.91715.7415.29M10X0.74459.309.3789.18817.7417.2944M10X0.59.509.5209.40019.7419.2944M11X1.010.0010.1539.91721.2520.75M11X0.710.3722510.3010.188824.2523.7522M12X1.510.5010.6710.376626.7726.21M12X1.210.9110.6411510.802公制細螺紋
規格
M12X1.0M12X0.5M14X1.5M14X1.0M15X1.5M15X1.0M16X1.5M16X1.0M17X1.5M17X1.0M18X2.0M18X1.5M18X1.0M20X2.0標準徑
11.0011.5012.5013.0013.5014.0014.5015.0015.5016.0016.0016.5017.0018.002級牙鑽孔徑
最大
11.15311.52012.67613.15313.67614.15314.67615.15315.67616.15316.21016.67617.15318.210最小
10.91711.40012.37612.91713.37613.91714.37614.91715.37615.91715.83516.37616.91717.835M20X1.5M20X1.0M22X2.0M22X1.5M22X1.0M24X2.0M24X1.5M24X1.0M25X2.0M25X1.5M25X1.0M26X1.5M27X2.0M27X1.5M27X1.0M28X2.0M28X1.5M28X1.018.5019.0020.0020.5021.0022.0022.5023.0023.0023.5024.0024.5025.0025.5026.0026.0026.5027.0018.67619.15320.21020.67621.15322.21022.67623.15323.21023.67624.15324.67625.21025.67626.15326.21026.67627.15318.37618.91719.83520.37620.91721.83522.37622.91722.83523.37623.91724.37624.83525.37625.91725.83526.37626.91M30X3.0M30X2.0M30X1.5M30X1.0M32X2.0M32X1.5M33X3.0M33X2.0M33X1.5M35X1.5M36X3.0M36X2.0M36X1.527.0028.0028.5029.0030.0030.5030.0031.0031.5033.5033.0034.0034.5027.25228.21028.67629.15330.21030.67630.25231.21031.67633.67633.25234.21034.67626.75227.83528.37628.91729.83530.37629.75230.83531.37633.37632.75233.83534.376
篇七：螺纹孔底径尺寸表
螺纹底孔直径尺寸表
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＝Φ5细扣螺距0.75＝Φ5.2M8:粗扣螺距1.25＝Φ6.细扣螺距1,0.75＝Φ7,Φ7.2M10:粗扣螺距1.5＝Φ8.5细扣螺距1.25,1,0.75＝Φ8.7,Φ9,Φ9.2M12:粗扣螺距1.75＝Φ10.2细扣螺距1.5,1.25,1＝Φ10.5,Φ10.7,Φ11M14:粗扣螺距2＝Φ11.细扣螺距1.5,1.25,1＝Φ12.5,Φ12.7,Φ13M16:粗扣螺距2＝Φ13.细扣螺距1.5,1＝Φ14.5,Φ15M18:粗扣螺距2.5＝Φ15.4细扣螺距2,1.5,1＝Φ15.9,Φ16.5,Φ17M20:粗扣螺距2.5＝Φ17.4细扣螺距2,1.5,1＝Φ17.9,Φ18.5,Φ19M22:粗扣螺距2.5＝Φ19.5细扣螺距2,1.5,1＝Φ19.9,Φ20.5,Φ21M24:粗扣螺距3＝Φ20.细扣螺距2,1.5,1＝Φ21.9,Φ22.5,Φ23M27:
粗扣螺距3＝Φ23.细扣螺距2,1.5,1＝Φ24.9,Φ25.5,Φ26M30:
粗扣螺距3.5＝Φ26.3细扣螺距3,2,1.5,1＝Φ26.9,Φ27.9,Φ28.5Φ2M33:
粗扣螺距3.5＝Φ29.3细扣螺距3,2,1.5,＝Φ29.9,Φ30.9,Φ31.5M36:
粗扣螺距4＝Φ31.细扣螺距3,2,1.5,＝Φ32.9,Φ33.9,Φ34.5M39:
粗扣螺距4＝Φ34.细扣螺距3,2,1.5,＝Φ35.9,Φ36.9,Φ37.5M42:
粗扣螺距4.5＝Φ37.3细扣螺距4,3,2,1.5,＝Φ37.8,Φ38.9,Φ39.9,Φ40.5M45:
粗扣螺距4.5＝Φ40.3细扣螺距4,3,2,1.5,＝Φ40.8,Φ41.9,Φ42.9,Φ43.5M48:
粗扣螺距5＝Φ42.细扣螺距4,3,2,1.5,＝Φ43.8,Φ44.9,Φ45.9,Φ46.5M52:
粗扣螺距5＝Φ46.细扣螺距4,3,2,1.5,＝Φ47.8,Φ48.9,Φ49.9,Φ50.5螺纹底孔直径尺寸表.txt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）
生产中钢料可按数值选取，软料钻头直径可选大些，但不可太大
