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1、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0-80UNF 3/643/64 .04691-64UNC #53 - .05951-72UNF #53 1/16 .05952-56UNC #50 - .07002-64UNF #50 - .07003-48UNC #47 5/64 .07853-56UNF #45 - .08204-36UNS #44 - .08604-40UNC #43 3/32 .08904-48UNF #42 3/32 .0935M30.60 2.5mm- .09841/8-40UNS #
2、38 - .10155-40UNC #38 - .10155-44UNF #37 - .10406-32UNC #35 7/64 .11006-36UNS #34 - .11106-40UNF #33 - .11306-48UNS #31 - .1200M40.70 3.4mm- .1338M40.75 3.4mm- .13388-32UNC #29 - .13608-36UNF #29 9/64 .13608-40UNS #28 - .14053/16-24UNS #26 - .147010-24UNC #25 5/32 .14953/16-32UNS #22 - .157010-32UNF
3、 #21 5/32 .1590M50.90 4.2mm- .1653M50.80 4.3mm- .1693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 Q 21/64.3320M101.50 8.7mm - .3425M101.25 8.9mm 11/32.3503M101.00* 9.1mm - .35837/16-14UNC 字母 U 23/64.3680M111.50 9.7mm - .38187/16-20UNF 25/6425/64.3906M121.75 10.5mm- .4133M121.50 10.7mm27/64.42121/2-1
4、3UNC 27/6427/64.4219M121.25* 10.9mm27/64.42911/2-20UNF 29/6429/64.45311/2-24UNS 29/6429/64.4531M142.00 12.2mm- .48039/16-12UNC 31/6431/64.4844M141.50 12.7mm- .4999M141.25* 12.8mm- .50399/16-18UNF 33/6433/64.51565/8-11UNC 17/3217/32.5312M162.00 14.2mm35/64.55905/8-18UNF 37/6437/64.5781M161.50 14.7mm-
5、 .578711/16-11UNS19/3219/32.5938M182.50 15.8mm39/64.522011/16-16UNS5/8 5/8 .62503/4-10UNC 21/3221/32.6562M181.50* 16.8mm- .66143/4-16UNF 11/1611/16.6875M202.50 17.8mm11/16.700812-24UNC #16 11/64 .177012-28UNF #14 3/16 .182012-32NEF #13 - .185014-20UNS #10 - .19351/4-20UNC #7 13/64 .201014-24UNS #7 -
6、 .2010M61.00 5.2mm- .20471/4-24UNS #4 - .20901/4-28UNF #3 7/32 .21301/4-32NEF 7/327/32 .21881/4-40UNS #1 - .2280M71.00 6.1mm15/64 .24015/16-18UNC 字母F 17/64 .2570M81.25 6.9mm17/64 .27165/16-24UNF 字母I - .2720M81.00 7.1mm- .27955/16-32NEF 9/329/32 .2812M91.2 7.9mm- .31103/8-16UNC 5/165/16 .3125M90.75 8
7、.3mm- .3268M91.00 8.1mm- .3189*该螺纹仅用于火花塞7/8-9UNC 49/6449/64.76567/8-14UNF 13/1613/16.8125M221.50 20.9mm- .82287/8-18UNS* 53/6453/64.8281M243.00 21.4mm53/64.84251-8UNC 7/8 7/8 .8750M242.00 22.3mm- .87791-12UNF 59/6459/64.92191-14UNS 15/1615/16.937511/8-7 UNC 63/6463/64.984411/8-12 UNF 13/64 13/64 1.0
8、46911/4-7 UNC 17/64 17/64 1.109411/4-12 UNF 111/64 111/64 1.171913/8-6 UNC 17/32 17/32 1.218813/8-12 UNF 119/64 119/64 1.296911/2-6 UNC 111/32 111/32 1.343811/2-12 UNF 127/64 127/64 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 - .33901/4-18NPT 7/16 7/16 .43753/8-18NPT 37/64 37/64 .57811/2-14NPT 45/64 45/64 .70313/4-14NPT 59/64 59/64 .92191-11 NPT 15/32 15/32 1.15621-11 NPT 1 1 1.50001-11 NPT 147/64 147/64 1.73442-11 NPT 27/32 27/32 2.2188
