模具之家讯：丝锥用底孔钻头直径表
(螺纹牙型高度为75%时的推荐钻头尺寸)
准备攻丝的螺纹钻头规格代码(最接近的英制分数规格)英制小数规格0-80UNF3/64"3/64".04691-64UNC#53-.05951-72UNF#531/16".05952-56UNC#50-.07002-64UNF#50-.07003-48UNC#475/64".07853-56UNF#45-.08204-36UNS#44-.08604-40UNC#433/32".08904-48UNF#423/32".0935M3×0.602.5mm-.09841/8-40UNS#38-.10155-40UNC#38-.10155-44UNF#37-.10406-32UNC#357/64".11006-36UNS#34-.11106-40UNF#33-.11306-48UNS#31-.1200M4×0.703.4mm-.1338M4×0.753.4mm-.13388-32UNC#29-.13608-36UNF#299/64".13608-40UNS#28-.14053/16"-24UNS#26-.147010-24UNC#255/32".14953/16"-32UNS#22-.157010-32UNF#215/32".1590M5×0.904.2mm-.1653M5×0.804.3mm-.169312-24UNC#1611/64".177012-28UNF#143/16".182012-32NEF#13-.185014-20UNS#10-.19351/4"-20UNC#713/64".201014-24UNS#7-.2010M6×1.005.2mm-.20471/4"-24UNS#4-.20901/4"-28UNF#37/32".21301/4"-32NEF7/32"7/32".21881/4"-40UNS#1-.2280M7×1.006.1mm15/64".24015/16"-18UNC字母F17/64".2570M8×1.256.9mm17/64".27165/16"-24UNF字母I-.2720M8×1.007.1mm-.27955/16"-32NEF9/32"9/32".2812M9×1.27.9mm-.31103/8"-16UNC5/16"5/16".3125M9×0.758.3mm-.3268M9×1.008.1mm-.3189*该螺纹仅用于火花塞准备攻丝的螺纹钻头规格代码(最接近的英制分数规格)英制小数规格3/8"-24UNF字母Q21/64".3320M10×1.508.7mm-.3425M10×1.258.9mm11/32".3503M10×1.00*9.1mm-.35837/16"-14UNC字母U23/64".3680M11×1.509.7mm-.38187/16"-20UNF25/64"25/64".3906M12×1.7510.5mm-.4133M12×1.5010.7mm27/64".42121/2"-13UNC27/64"27/64".4219M12×1.25*10.9mm27/64".42911/2"-20UNF29/64"29/64".45311/2"-24UNS29/64"29/64".4531M14×2.0012.2mm-.48039/16"-12UNC31/64"31/64".4844M14×1.5012.7mm-.4999M14×1.25*12.8mm-.50399/16"-18UNF33/64"33/64".51565/8"-11UNC17/32"17/32".5312M16×2.0014.2mm35/64".55905/8"-18UNF37/64"37/64".5781M16×1.5014.7mm-.578711/16"-11UNS19/32"19/32".5938M18×2.5015.8mm39/64".522011/16"-16UNS5/8"5/8".62503/4"-10UNC21/32"21/32".6562M18×1.50*16.8mm-.66143/4"-16UNF11/16"11/16".6875M20×2.5017.8mm11/16".70087/8"-9UNC49/64"49/64".76567/8"-14UNF13/16"13/16".8125M22×1.5020.9mm-.82287/8"-18UNS*53/64"53/64".8281M24×3.0021.4mm53/64".84251"-8UNC7/8"7/8".8750M24×2.0022.3mm-.87791"-12UNF59/64"59/64".92191"-14UNS15/16"15/16".937511/8"-7 UNC63/64"63/64".984411/8"-12 UNF13/64"13/64"1.046911/4"-7 UNC17/64"17/64"1.109411/4"-12 UNF111/64"111/64"1.171913/8"-6 UNC17/32"17/32"1.218813/8"-12 UNF119/64"119/64"1.296911/2"-6 UNC111/32"111/32"1.343811/2"-12 UNF127/64"127/64"1.4219NPT螺纹底孔表
(螺纹牙型高度为75%时的推荐钻头尺寸)
准备攻丝的螺纹钻头规格代码(最接近的英制分数规格)英制小数规格1/8"-27NPT字母R-.33901/4"-18NPT7/16"7/16".43753/8"-18NPT37/64"37/64".57811/2"-14NPT45/64"45/64".70313/4"-14NPT59/64"59/64".92191"-11½ NPT15/32"15/32"1.15621¼"-11 ½ NPT1½"1½"1.50001½"-11 ½ NPT147/64"147/64"1.73442"-11½ NPT27/32"27/32"2.2188
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