螺纹攻牙底孔对照表.pdf

攻丝底孔对照表

M Metrisches ISO Regelgewinde / Metric ISO thread / Filetage métrique ISO standard / Filettatura metrica ISO / Rosca Métrica ISO Kurzzeichen Thread size Désignation Diametro del ?letto Dimensión rosca (DIN 13) Bohrer-; Nominal size diamètre du foret Diametro nominale ;-Taladro (mm) (acc. to DIN 336) Innengewindekern-; Minor diameter / Diamètre du noyau ?leté / Diametro del nocciolo ;-nucleo de rosca interior (mm) min 6H m a x M 10,750,7290,785* M 1,20,950,9290,985* M 1,41,11,0751,142* M 1,61,251,2211,321 M 1,71,351,3211,421 M 1,81,451,4211,521 M 21,61,5671,679 M 2,21,751,7131,838 M 2,31,851,8131,938 M 2,52,052,0132,138 M 2,62,152,1132,238 M 32,52,4592,599 M 3,52,92,8503,010 M 43,33,2423,422 M 4,53,73,6883,878 M 54,24,1344,334 M 654,9175,153 M 765,9176,153 M 86,86,6476,912 M 97,87,6477,912 M 108,58,3768,676 M 119,59,3769,676 M 1210,210,10610,441 M 141211,83512,210 M 161413,83514,210 M 1815,515,29415,744 M 2017,517,29417,744 M 2219,519,29419,744 M 242120,75221,252 M 272423,75224,252 M 3026,526,21126,771 M 3329,529,21129,771 M 363231,67032,270 M 393534,67035,270 M 4237,537,12937,799 M 4540,540,12940,799 M 484342,58743,297 M 524746,58747,297 M 5650,550,04650,796MF Metrisches ISO Feingewinde / Metric ISO Fine thread / Filetage métrique ?n ISO / Filettatura metrica ISO ?ne / Rosca Métrica ISO Fina Kurzzeichen Thread size Désignation Diametro del ?letto Dimensión rosca (DIN 13) Bohrer-; Nominal size diamètre du foret Diametro nominale ;-Taladro (mm) (acc. to DIN 336) Innengewindekern-; Minor diameter / Diamètre du noyau ?leté / Diametro del nocciolo ;-nucleo de rosca interior (mm) min 6H m a x M 2 x 0,251,751,7291,785 M 2,2 x 0,251,951,9291,985 M 2,3 x 0,252,052,0292,085 M 2,5 x 0,352,152,1212,221 M 3 x 0,252,752,7292,785 M 3 x 0,352,652,6212,721 M 3,5 x 0,353,153,1213,221 M 4 x 0,353,653,6213,721 M 4 x 0,53,53,4593,599 M 4,5 x 0,543,9594,099 M 5 x 0,354,654,6214,721 M 5 x 0,54,54,4594,599 M 5 x 0,754,24,1884,378 M 6 x 0,55,55,4595,599 M 6 x 0,755,255,1885,378 M 7 x 0,56,56,4596,599 M 7 x 0,756,256,1886,378 M 8 x 0,57,57,4597,599 M 8 x 0,757,257,1887,378 M 8 x 176,9177,153 M 9 x 0,758,258,1888,378 M 9 x 187,9178,153 M 10 x 0,59,59,4599,599 M 10 x 0,759,259,1889,378 M 10 x 198,9179,153 M 10 x 1,258,758,6478,912 M 11 x 1109,91710,153 M 12 x 0,511,511,45911,599 M 12 x 11110,91711,153 M 12 x 1,2510,7510,64710,912 M 12 x 1,510,510,37610,676 M 13 x 11211,91712,153 M 14 x 0,7513,213,18813,378 M 14 x 11312,91713,153 M 14 x 1,2512,7512,64712,912 M 14 x 1,512,512,37612,676 M 15 x 11413,91714,153 M 15 x 1,513,513,37613,676 M 16 x 0,7515,215,18815,378 M 16 x 11514,91715,153 M 16 x 1,2514,814,64714,912 M 16 x 1.514,514,37614,676 M 17 x 11615,91716,153 M 18 x 11716,91717,153 M 18 x 1.516,516,37616,676 M 18 x 21615,83516,210 M 20 x 11918,91719,153 M 20 x 1.518,518,37618,676 M 20 x 21817,83518,210 M 22 x 12120,91721,153 M 22 x 1,520,520,37620,676 * 5H max Gewindekernl?cher für Gewindebohrer Tapping drill sizes for taps / Avant-trous de taraudage Prefori per maschi / Dimensiones de la broca previa para machos MARYLAND METRICS Technical Data Chart: A collection of Tapping drill sizes for taps in a multilingual format https://www.wendangku.net/doc/de14902900.html,

螺纹底孔直径尺寸表

螺纹底孔直径尺寸表 M1:粗扣螺距0.25＝Φ0.75 细扣螺距0.2＝Φ0.8 M2:粗扣螺距0.4＝Φ1.6 细扣螺距0.25＝Φ1.8 M3:粗扣螺距0.5＝Φ2.5 细扣螺距0.35＝Φ2.7 M4:粗扣螺距0.7＝Φ3.3 细扣螺距0.5＝Φ3.5 M5:粗扣螺距0.8＝Φ4.2 细扣螺距0.5＝Φ4.5 M6:粗扣螺距1＝Φ5 细扣螺距0.75＝Φ5.2 M8:粗扣螺距1.25＝Φ6.7 细扣螺距1,0.75＝Φ7,Φ7.2 M10:粗扣螺距1.5＝Φ8.5 细扣螺距1.25,1,0.75＝Φ8.7,Φ9,Φ9.2 M12:粗扣螺距1.75＝Φ10.2 细扣螺距1.5,1.25,1＝Φ10.5,Φ10.7,Φ11 M14:粗扣螺距2＝Φ11.9 细扣螺距1.5,1.25,1＝Φ12.5,Φ12.7,Φ13 M16:粗扣螺距2＝Φ13.9 细扣螺距1.5,1＝Φ14.5,Φ15 M18:粗扣螺距2.5＝Φ15.4 细扣螺距2,1.5,1＝Φ15.9,Φ16.5,Φ17 M20:粗扣螺距2.5＝Φ17.4 细扣螺距2,1.5,1＝Φ17.9,Φ18.5,Φ19 M22:粗扣螺距2.5＝Φ19.5 细扣螺距2,1.5,1＝Φ19.9,Φ20.5,Φ21 M24:粗扣螺距3＝Φ20.9 细扣螺距2,1.5,1＝Φ21.9,Φ22.5,Φ23 M27: 粗扣螺距3＝Φ23.9 细扣螺距2,1.5,1＝Φ24.9,Φ25.5,Φ26 M30: 粗扣螺距3.5＝Φ26.3 细扣螺距3,2,1.5,1＝Φ26.9,Φ27.9,Φ28.5Φ29 M33: 粗扣螺距3.5＝Φ29.3 细扣螺距3,2,1.5,＝Φ29.9,Φ30.9,Φ31.5 M36: 粗扣螺距4＝Φ31.8 细扣螺距3,2,1.5,＝Φ32.9,Φ33.9,Φ34.5 M39: 粗扣螺距4＝Φ34.8 细扣螺距3,2,1.5,＝Φ35.9,Φ36.9,Φ37.5 M42: 粗扣螺距4.5＝Φ37.3 细扣螺距4,3,2,1.5,＝Φ37.8,Φ38.9,Φ39.9,Φ40.5 M45: 粗扣螺距4.5＝Φ40.3 细扣螺距4,3,2,1.5,＝Φ40.8,Φ41.9,Φ42.9,Φ43.5 M48: 粗扣螺距5＝Φ42.7 细扣螺距4,3,2,1.5,＝Φ43.8,Φ44.9,Φ45.9,Φ46.5 M52: 粗扣螺距5＝Φ46.7 细扣螺距4,3,2,1.5,＝Φ47.8,Φ48.9,Φ49.9,Φ50.5 第 1 页

攻牙底孔参数

攻牙底孔的使用参数表 一、螺紋下孔徑表 1、公制粗牙螺紋JIS B 0209-1982(單位：mm) 螺纹尺寸钻头直径螺纹下孔徑內螺紋小徑 最小直径最大直径 M1×0.25 0.75 0.78 (80%) 0.729 0.785 1.1 ×0.25 0.85 0.88 (80%) 0.829 0.885 1.2 ×0.25 0.95 0.98 (80%) 0.929 0.985 1.4 ×0.3 1.1 1.14 (80%) 1.075 1.142 1.6 ×0.35 1.25 1.32 (75%) 1.221 1.321 1.8 ×0.35 1.45 1.52 (75%) 1.421 1.521 2×0.4 1.6 1.65 (80%) 1.567 1.679 2.2 ×0.45 1.75 1.83 (75%) 1.713 1.838 2.5 ×0.45 2.1 2.13 (75%) 2.013 2.138 3×0.5 2.5 2.59 (75%) 2.459 2.599 3.5 ×0.6 2.9 3.01 (75%) 2.850 3.010 4×0.7 3.3 3.39 (80%) 3.242 3.422 4.5 ×0.75 3.8 3.85 (80%) 3.688 3.878 5×0.8 4.2 4.31 (80%) 4.134 4.334 6×1 5 5.13 (80%) 4.917 5.153 7×1 6 6.13 (80%) 5.917 6.153 8×1.25 6.8 6.85 (85%) 6.647 6.912 9×1.25 7.8 7.85 (85%) 7.647 7.912 10×1.5 8.5 8.62 (85%) 8.376 8.676 11×1.5 9.5 9.62 (85%) 9.376 9.676 12×1.75 10.3 10.40 (85%) 10.106 10.441 14×2 12 12.2 (85%) 11.835 12.210 16×2 14 14.2 (85%) 13.835 14.210 18×2.5 15.5 15.7 (85%) 15.294 15.744 20×2.5 17.5 17.7 (85%) 17.294 17.744 22×2.5 19.5 19.2 (85%) 19.294 19.744 24×3 21 21.2 (85%) 20.752 21.252 27×3 24 24.2 (85%) 23.752 24.252 30×3.5 26.5 26.6 (90%) 26.211 26.771 33×3.5 29.5 29.6 (90%) 29.211 29.771 36×4 32 32.1 (90%) 31.670 32.270 39 ×4 35 35.1 (90%) 34.670 35.270 42 ×4.5 37.5 37.6 (90%) 37.129 37.799 45 ×4.5 40.5 40.6 (90%) 40.129 40.799 48 ×5 43 43.1 (90%) 42.587 43.297 註(1)M1.4以下等級：5H、M1.6以上等級：6H (2)基於JIS B 0209-1982標準

普通螺纹攻丝前底孔尺寸(in)

普通螺纹攻丝前底孔尺寸 螺纹的直径和螺距钻孔直径车孔直径螺纹的直 径和螺距 钻孔直径车孔直径 铸铁 青铜 钢 黄铜 直径公差铸铁 青铜 钢 黄铜 直径公差 M4*0.7 M4*0.5 3.3 3.5 3.3 3.5 M27**3 M27*2 23.7 24.7 23.9 24.9 23.5 +0.3 M5*0.8 M5*0.5 4.1 4.4 4.2 4.5 M27*1.5 M27*1 25.3 25.8 25.5 26 M6*1 M6*0.75 4.9 5.1 5 5.2 4.9 - +0.3 M30*3.5 M30*3 26 26.7 26.2 26.9 26 +0.3 M8*1.25 M8*1 6.6 6.9 6.7 7 6.6 - +0.2 M30*2 M30*1.5 27.7 28.3 27.9 28.5 M10*1.5 M10*1.25 M10*1 8.4 8.6 8.9 8.5 8.7 9 8.3 - - +0.25 M33*3.5 M33*3 M33*2 29 29.7 30.7 29.2 29.9 30.9 29 +0.3 M12*1.75 M12*1.5 M12*1.25 M12*1 10.1 10.4 10.6 10.9 10.2 10.5 10.7 11 10 +0.25 M33*1.5 M36*4 M36*3 M36*1.5 31.3 31.5 32.7 34.3 31.5 31.7 32.9 34.5 - 31.4 32.5 34.3 - +0.3 +0.17 +0.17 M14*2 M14*1.5 M14*1 11.8 12.4 12.9 11.9 12.5 13 11.7 +0.3 M39*4 M39*3 M39*1.5 34.6 35.7 37.3 34.8 35.9 37.5 34.4 35.5 37.3 +0.3 +0.17 +0.17 M16*2 M16*1.5 M16*1 13.8 14.4 14.9 13.9 14.5 15 13.7 +0.3 M42*4.5 M42*3 M42*1.5 37.1 38.7 40.3 37.3 38.9 40.5 36.8 38.5 40.3 +0.3 +0.17 +0.17 M18*2.5 M18*2 M18*1.5 M18*1 15.3 15.8 16.4 16.9 15.4 15.9 16.5 17 15.1 +0.3 M45*4.5 M45*3 M45*1.5 40 41.8 43.3 40.2 42 43.5 39.8 41.5 43.3 +0.3 +0.17 +0.17 M20*2.5 M20*2 M20*1.5 M20*1 17.2 17.7 18.3 18.8 17.4 17.9 18.5 19 17.1 +0.3 M48*5 M48*3 M48*1.5 42.5 44.8 46.3 42.7 45 46.5 42.2 44.5 46.3 +0.3 +0.17 +0.17 M22*2.5 M22*2 M22*1.5 M22*1 19.2 19.7 20.3 20.8 19.4 19.9 20.5 21 19.1 +0.3 M52*5 M52*3 M52*1.5 46.4 48.8 50.3 46.6 49 50.5 46.2 48.5 50.2 +0.3 +0.17 +0.17 M24*3 M24*2 M24*1 20.7 21.7 22.8 20.9 21.9 23 20.5 +0.3 M56*5.5 M56*4 M56*2 - - - - - - 49.7 51.4 53.7 +0.3 +0.2 +0.2

螺纹底孔对照表(技巧学习)

螺纹底孔直径公制普通粗牙螺纹 螺纹代号 钻头直径HSS 硬质合金 M2×0.4 1.6 1.65 M3×0.5 2.5 2.55 M4×0.7 3.3 3.4 M5×0.8 4.2 4.3 M6×1.0 5.0 5.1 M8×1.25 6.8 6.9 M10×1.5 8.5 8.7 M12×1.75 10.3 10.5 M14×2.0 12.0 12.2 M16×2.0 14.0 14.2 M18×2.5 15.5 15.7 M20×2.5 17.5 17.7 M24×3.0 21.0 ……M30×3.5 26.5 ……M36×4.0 32.0 ……M42×4.5 37.5 ……M45×4.5 40.5 ……M48×5.0 43.0 ……

公制细牙螺纹 螺纹代号 钻头直径HSS 硬质合金 M2×0.25 1.75 1.75 M3×0.35 2.7 2.7 M4×0.5 3.5 3.55 M5×0.5 4.5 4.55 M6×0.75 6.3 6.35 M8×1.0 7 7.1 M8×0.75 7.3 7.35 M10×1.0 9 9.1 M10×1.25 8.8 8.9 M10×0.75 9.3 9.35 M12×1.5 10.5 10.7 M12×1.25 10.8 10.9 M12×1.0 11 11.1 M14×1.5 12.5 12.7 M14×1.0 13.0 13.1 M16×1.5 14.5 14.7 M16×1.0 15.0 15.1 M18×1.5 16.5 16.7 M18×1.0 17 17.1

M20×2.0 18 18.3 M20×1.5 18.5 18.7 M20×1.0 19 19.1 M24×2.0 22.0 ……M24×1.5 22.5 ……M24×1.0 23.0 ……M30×3 27 ……M30×2 28 ……M30×1.5 28.5 ……M30×1.5 29 ……M36×3.0 33.0 ……M36×2 34.0 ……M36×1.5 34.5 ……M42×4 38 ……M42×3 39 ……M42×2 40 ……M42×1.5 40.5 ……M45×4 41 ……M45×3 42 ……M45×2 43 ……M45×1.5 43.5 ……

螺纹底孔尺寸

摘要：在板料冲压件上，按其料厚不同分别采用精冲小孔、变薄翻边、冷冲挤等工艺方法，成形螺纹底孔。本文论述了上述螺纹冲压成形工艺、冲模结构及其设计与制造技术。 主题词：冲件螺纹底孔冲小孔变薄翻边冷冲挤成形技术 螺纹联接结构，尤其紧螺纹联接结构，是各种机电与家电产品中零部件最主要的联接结构型式。薄板冲压件进行紧螺纹联接，需要有大于料厚的联接螺纹长度，以确保其联接可靠性，增强其负载能力，才能达到使薄板冲件联接牢靠、重量小的目的，从而使其成为结实、轻巧、紧凑的理想结构零件。 在仪器仪表、电子电器、各类家电、家用器具、玩具等产品的板料冲压件上，经常采用M2-M10 的小螺纹紧联接结构。为提高效率并满足大量生产的需求，采用精冲小孔、变薄翻边、冷冲挤等工艺方法，冲压成形这些小螺纹底孔，不仅能以冲压制孔取代钻孔而大幅度提高生产效率，同时能获得尺寸精确、一致性好的底孔，并可使螺纹联接有足够的长度，从而确保其联接可靠性及设计要求的承载能力。所以，用冲压成形技术加工小螺纹底孔，具有优质高产的效果，也是一种成熟而值得推广的工艺技术。 1 螺纹底孔的计算 合适螺纹底孔的大小，不仅取决于螺纹直径，而且与其螺距有着密切的关系，通常可按下式计算： 当t L≤1 时，取：d Z=d-t L 当t L>1 时，取：d Z=d-(1.04 ～1.06)t L (2) 式中t L-螺距，mm d z-螺纹底孔直径，mm d-螺纹直径，mm 表 1 螺纹底孔直径的合理值(mm) 螺纹直径d螺距t L底孔直径d z M1 M20.25 0.40.75 1.6 M30.5 2.5 M40.7 3.3 M50.8 4.2 M6 15 M8 1.25 6.7 M10 1.58.5 M12 1.7510.2 M14 11.9 2 13.9 M16 2 M18 2.515.4 M20 2.517.4

最全的螺纹孔径对照表

最大最小最大最小G4-G6G7-G8G9M1.0*0.250.750.7850.729M12*1.011.0011.15310.917M1.0*0.250.860.88M1.1*0.250.850.8850.829M12*0.511.5011.52011.400M1.1*0.250.960.98最大M1.2*0.250.950.9850.929M14*1.512.5012.67612.376M1.2*0.25 1.06 1.08G 1/167.72 6.84M1.4*0.3 1.10 1.142 1.075M14*1.013.0013.15312.917M1.4*0.3 1.24 1.25G(PF)1/89.738.85M1.6*0.35 1.25 1.321 1.221M15*1.513.5013.67613.376M1.6*0.35 1.41 1.431/413.1611.89M1.7*0.35 1.35 1.421 1.321M15*1.014.0014.15313.917M1.7*0.35 1.51 1.533/816.6615.40M1.8*0.35 1.45 1.521 1.421M16*1.514.5014.67614.376M1.8*0.35 1.61 1.631/220.9619.17M2.0*0.4 1.60 1.679 1.567M16*1.015.0015.15314.917M2*0.4 1.78 1.805/822.9121.13M2.2*0.45 1.75 1.838 1.713M17*1.515.5015.67615.376M2.2*0.45 1.95 1.983/426.4424.66M2.3*0.4 1.90 1.979 1.867M17*1.016.0016.15315.917M2.3*0.4 2.08 2.107/830.2028.42M2.5*0.45 2.10 2.138 2.013M18*2.016.0016.21015.835M2.5*0.45 2.25 2.28133.2530.93M2.6*0.45 2.20 2.238 2.113M18*1.516.5016.67616.376M2.6*0.45 2.35 2.38 1.12537.9035.58M3.0*0.5 2.50 2.599 2.459M18*1.017.0017.15316.917M3.0*0.5 2.73 2.75 1.2541.9139.59M3.0*0.6 2.40 2.440 2.280M20*2.018.0018.21017.835M3.5*0.6 3.17 3.20 1.37544.3242.01M3.5*0.6 2.90 3.010 2.850M20*1.518.5018.67618.376M4.0*0.7 3.62 3.65 3.69 1.547.8049.02M4.0*0.7 3.30 3.422 3.242M20*1.019.0019.15318.917M5.0*0.8 4.56 4.60 4.64 1.62551.9150.79M4.0*0.75 3.25 3.326 3.106M22*2.020.0020.21019.835M6.0*1.0 5.45 5.50 5.55 1.7553.7556.66 M4.5*0.75 3.80 3.878 3.688M22*1.520.5020.67620.376M7.0*1.0 6.45 6.50 6.552 59.61 M5.0*0.8 4.20 4.334 4.134M22*1.021.0021.15320.917M8.0*1.257.317.387.44M5.0*0.9 4.10 4.170 3.930M24*2.022.0022.21021.835M10*1.59.189.259.32M6.0*1.0 5.00 5.153 4.917M24*1.522.5022.67622.376M10*1.259.319.389.44M7.0*1.0 6.00 6.153 5.917M24*1.023.0023.15322.917M12*1.7511.0411.1211.21M8.0*1.25 6.80 6.912 6.647M25*2.023.0023.21022.835M12*1.25 11.3111.3811.44 M9.0*1.257.807.9127.647M25*1.523.5023.67623.376最大M10*1.58.508.6768.376M25*1.024.0024.15323.917PS 1/16 - 28 6.50 6.632M11*1.59.509.6769.376M26*1.524.5024.67624.376PS 1/8 - 288.508.637M12*1.7510.3010.44110.106M27*2.025.0025.21024.835PS 1/4 - 1911.4011.549M14*2.012.0012.21011.835M27*1.525.5025.67625.376PS 3/8 - 1915.0015.054M16*2.014.0014.21013.835M27*1.026.0026.15325.917PS 1/2 - 1418.5018.773M18*2.515.5015.74415.294M28*2.026.0026.21025.835PS 3/4 - 1424.0024.259M20*2.517.5017.74417.294M28*1.526.5026.67626.376PS 1 - 1130.2030.471M22*2.519.5019.74419.294M28*1.027.0027.15326.917规格PS 1-1/4 - 1138.8039.132M24*3.021.0021.25220.752M30*3.027.0027.25226.752(UNC) 最大最小PS 1-1/2 - 1144.8045.025M27*3.024.0024.25223.752M30*2.028.0028.21027.835 (螺丝牙外径) PS 2 - 11 56.50 56.836 M30*3.5 26.50 26.771 26.211 M30*1.528.5028.67628.376No.1-64(1.854) 1.55 1.582 1.425M30*1.029.0029.15328.917No.2-56(2.184) 1.80 1.871 1.695M32*2.030.0030.21029.835No.3-48(2.515) 2.10 2.146 1.941M32*1.530.5030.67630.376No.4-40(2.845) 2.30 2.385 2.157M33*3.030.0030.25229.752No.5-40(3.175) 2.60 2.697 2.487M33*2.031.0031.21030.835No.6-32(3.505) 2.80 2.895 2.642最大最小M33*1.531.5031.67631.376No.8-32(4.166) 3.40 3.530 3.302M1.0*0.20.800.8210.783M35*1.533.5033.67633.376No.10-24(4.826) 3.90 3.962 3.683M1.1*0.20.900.9210.883M36*3.033.0033.25232.752No.12-24(5.486) 4.50 4.597 4.344PT 1/16 -28 6.10 6.20 6.244 6.384M1.2*0.2 1.00 1.0210.983M36*2.034.0034.21033.8351/4 - 20 5.10 5.257 4.979PT 1/8 -288.108.208.4298.388M1.4*0.2 1.20 1.221 1.183M36*1.5 34.50 34.67634.376 5/16 - 18 6.60 6.731 6.401PT 1/4 -1910.7011.0010.96211.174M1.6*0.2 1.40 1.421 1.3833/8 - 168.008.1537.798PT 3/8 -1914.2014.5014.44814.658M1.7*0.2 1.45 1.500 1.4607/16 - 149.409.5509.144PT 1/2 -1417.6018.0017.97918.263M1.8*0.2 1.60 1.621 1.5831/2 - 1310.8011.02310.592PT 3/4 -1423.0023.5023.37823.663M2.0*0.25 1.75 1.785 1.7299/16 - 1212.2012.44611.989PT 1 -1129.0029.5029.45929.822M2.2*0.25 1.95 1.985 1.929规格5/8 - 1113.6012.86813.386PT 1-1/4 -1137.5038.0037.97638.339M2.3*0.25 2.05 2.061 2.001(UNF) 最大最小3/4 - 1016.5018.84016.307PT 1-1/2 -1143.4044.0043.86944.232M2.5*0.35 2.20 2.221 2.1217/8 - 919.5019.76119.177PT 2 -11 54.9055.5055.41255.844 M2.6*0.35 2.20 2.246 2.186No.0-80(1.524) 1.25 1.305 1.182 1 - 822.2022.60621.971M3.0*0.35 2.70 2.721 2.621No.1-72(1.854) 1.55 1.612 1.4741-1/8 - 725.0025.34924.638M3.5*0.35 3.20 3.221 3.121No.2-64(2.184) 1.85 1.912 1.7561-1/4 - 728.2028.52427.813M4.0*0.5 3.50 3.599 3.459No.3-56(2.515) 2.10 2.197 2.0251-3/8 - 630.8031.11530.353M4.5*0.5 4.00 4.099 3.959No.4-48(2.845) 2.40 2.458 2.2711-1/2 - 634.0034.29033.528M5.0*0.5 4.50 4.599 4.459No.5-44(3.175) 2.70 2.740 2.5511-3/4 - 5 39.5039.82738.964M5.5*0.5 5.00 5.099 4.959No.6-40(3.505) 2.90 3.022 2.820 2 - 4-1/245.20 45.593 44.679 使用绞刀时不用绞刀时 M6.0*0.75 5.30 5.378 5.188No.8-36(4.166) 3.50 3.606 3.4041/16 - 27 6.10 6.25M6.0*0.5 5.50 5.550 5.400No.10-32(4.826) 4.10 4.165 3.9631/8 -278.338.43M7.0*0.75 6.30 6.378 6.188No.12-28(5.846) 4.60 4.724 4.4961/4 -1810.7211.13M7.0*0.5 6.50 6.550 6.4001/4 - 28 5.50 5.588 5.3603/8 -1814.2714.27M8.0*1.07.007.153 6.9175/16 - 24 6.907.035 6.782规格1/2 -1417.4817.86M8.0*0.757.307.3787.1883/8 - 248.508.6368.382(UNEF)最大最小3/4 -1422.6323.01M8.0*0.57.507.5207.4007/16 - 209.9010.0339.729No.12 - 32 4.70 4.826 4.623 1 -11-1/228.5828.98M9.0*1.08.008.1537.9171/2 - 2011.5011.60711.3291/4 - 32 5.60 5.690 5.4861-1/4 -11-1/237.3137.69M9.0*0.758.308.3788.1889/16 - 1812.9013.08112.7515/16 - 327.107.2647.0871-1/2 -11-1/243.6644.04M10*1.258.808.9128.4675/8 - 1814.5014.68114.3513/8 - 328.708.8658.661 2 -11-1/2 55.5855.96 M10*1.09.009.1538.9173/4 - 1617.5017.67817.3237/16 - 2810.2010.33810.135M10*0.759.309.3789.1887/8 - 1420.5020.67520.2701/2 - 2811.8011.93811.709M10*0.59.509.5209.400 1 - 1223.2023.57123.1149/16 - 2413.2013.38613.132M11*1.010.0010.1539.9171-1/8 - 1226.5026.74626.2895/8 - 2414.8014.98614.732M11*0.7510.3010.37810.1881-1/4 - 1229.5029.92129.4643/4 - 2017.8017.95817.678M12*1.510.5010.67610.3761-3/8 - 1232.8033.09632.6397/8 - 2021.0021.13320.853M12*1.25 10.80 10.91210.647 1-1/2 - 1236.0 36.271 35.814 1 - 20 24.00 24.30824.028 规 格使用绞刀时不用绞刀时 有效牙部之长度(最小)中之母螺牙内径 标准长度(最小)中之母螺牙内径 螺 纹 攻 牙 钻 孔 径 和 滚 造 径 对 照 表 英制平行管用螺紋PF(G) (單位：mm) 大 径钻孔径 规格公 制 细 螺 纹 规格 标准径2级牙钻孔径标准径 2级牙钻孔径美 制 特 细 螺 纹 规 格 (螺丝牙外径) 美 制 细 螺 纹 美 制 管 螺 纹 钻 孔 径 标准径 美 制 粗 螺 纹 标准径2级牙钻孔径公 制 粗 螺 纹 公 制 迫 牙 丝 攻 钻 孔 径 规 格精 度 等 级公 制 细 螺 纹 2级牙钻孔径标准径规格14.95 18.6320.5924.12最小6.568.5711.4541.3745.4949.6751.4327.8830.2934.9438.958.49511.341英 制 管 螺 纹 钻孔径 最小规格标准径N P T 14.84623.97530.11138.77218.48944.66556.476 英 制 管 螺 纹 规格18.2623.4229.366.3511.1314.68N P S 44.4556.36 38.108.7457.30 6.490注：迫牙丝攻之钻孔径，在上表所列之数值，由于被加工 材料之材质、硬度、形状、尺寸等之影响，多少会有所变动，因此于参考上表之同时，亦请增减若干。 标准径2级牙钻孔径标准径 2级牙钻孔径

螺纹孔底孔尺寸表

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）

M20X1.5 18.50 18.676 18.376 M20X1.0 19.00 19.153 18.917 M22X2.0 20.00 20.210 19.835 M22X1.5 20.50 20.676 20.376 M22X1.0 21.00 21.153 20.917 M24X2.0 22.00 22.210 21.835 M24X1.5 22.50 22.676 22.376 M24X1.0 23.00 23.153 22.917 M25X2.0 23.00 23.210 22.835 M25X1.5 23.50 23.676 23.376 M25X1.0 24.00 24.153 23.917 M26X1.5 24.50 24.676 24.376 M27X2.0 25.00 25.210 24.835 M27X1.5 25.50 25.676 25.376 M27X1.0 26.00 26.153 25.917 M28X2.0 26.00 26.210 25.835 M28X1.5 26.50 26.676 26.376 M28X1.0 27.00 27.153 26.917

攻牙下孔径对照表

建議下孔徑Recommended Tap Drill Sizes ◎公製牙

● ● D1：Minor diameter of JIS Class 2 internal thread. But, the minor diameters D1 shown in ( ) are of JIS Class I internal threads because their nominal sizes are not specified in JIS Class 2. ● * Marked sizes have been eliminated from JIS since 1969. ◎公製牙

● The reccommended tap drill sizes indicated above are for JIS Class 2 Metric threads. ● D1：Minor diameter of JIS Class 2 internal thread. But, the minor diameters D1 shown in ( ) are of JIS Class I internal threads because their nominal sizes are not specified in JIS Class 2. ◎美製牙─ UNC，UNF

● The recommended tap drill sizes indicated above are for JIS Class 2B UNC & UNF threads, and ANSI BI . Ia Class 2B UNEF & UN threads. ● D1：Minor diameter of internal thread. For UNC and UNF threads, according to JIS Class 2B; For UNEF and UN threads, according to ANSI BI . Ia, Class 2B. ◎英製牙─ BSW ● The recommended tap drill sizes indicated above are for JIS Class 2 Whitworth threads. ● Generally, the tap drill sizes in column A are used for producing holes; When holes tend to be cut oversized, the tap drill sizes in column B should be selected. ● These tap drill sizes are in accordance with JIS B 1004-1966, while the nominal sizes with a * mark are in accordance with BSW (Please refer to page 135).

螺纹孔底孔尺寸表

底孔： 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，称之为底孔。 若底孔直径与内螺纹直径一致材料扩张时就会卡住丝锥，这时丝锥容易折断；若过大，就会使攻出的螺纹牙型高度不够而形成废品。螺纹配合根据不同的国际标准，需要有相应的配合公差，可以查钳工手册。底孔如果是沉孔还需考虑攻丝排削影响！ 底孔直径： 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）钻孔深度： 攻盲孔（不通孔）的螺纹时，因丝锥不能攻到底，所以孔的深度要大于螺纹的长度， 盲孔的深度可按下面的公式计算： 孔的深度=所需螺纹的深度+0.7d 公制螺纹的计算方法： 底径=大径-1.0825*螺距

英制螺纹的计算方法： 底径=大径-1.28*螺距 钻孔： 钻孔是指用钻头在实体材料上加工出孔的操作。这里讲述了勘探工作里的钻孔工作，以及钻孔需要的辅助工具以及部分应急措施方法。 在地质勘查工作中，利用钻探设备向地下钻成的直径较小深度较大的柱状圆孔，又称钻井。钻探石油和天然气以及地下水的钻孔直径较大些。钻孔直径和深度大小，取决于地质矿产埋藏深度和钻孔的用途。 解释： 钻孔各部位的名称如图所示。钻孔起始部位称孔口，侧部称孔壁，底部称孔底。钻孔的直径D简称孔径，孔口直径称开孔口径，孔底直径称终孔直径。从孔口至孔底的距离H称钻孔深度，简称孔深。钻孔的某一段称孔段。 通常指用尖锐的旋转工具在坚硬的物体上钻穿。如：在木板上钻孔。在数处给一块金属板钻孔。用凿岩机(在坚固材料中)钻孔洞。在花岗岩上钻孔。2.指为了装饰、识别或便于分开而(常用机器)打一排小孔或花样。形似独木舟有时钻孔作为垂饰的船形宝石。