丝锥用底孔钻头的直径表

1、丝锥用底孔钻头的直径表 (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 3/64" 3/64" .0469 1-64UNC #53 - .0595 1-72UNF #53 1/16" .0595 2-56UNC #50 - .0700 2-64UNF #50 - .0700 3-48UNC #47 5/64" .0785 3-56UNF #45 - .0820 4-36UNS #44 - .0860 4-40UNC #43 3/32" .0890 4-48UNF #4

2、2 3/32" .0935 M3×0.60 2.5mm - .0984 1/8-40UNS #38 - .1015 5-40UNC #38 - .1015 5-44UNF #37 - .1040 6-32UNC #35 7/64" .1100 6-36UNS #34 - .1110 6-40UNF #33 - .1130 6-48UNS #31 - .1200 M4×0.70 3.4mm - .1338 M4×0.75 3.4mm - .1338 8-32UNC #29 - .1360 8-36UNF #29 9/64" .1360

3、8-40UNS #28 - .1405 3/16"-24UNS #26 - .1470 10-24UNC #25 5/32" .1495 3/16"-32UNS #22 - .1570 10-32UNF #21 5/32" .1590 M5×0.90 4.2mm - .1653 M5×0.80 4.3mm - .1693 12-24UNC #16 11/64" .1770 12-28UNF #14 3/16" .1820 12-32NEF #13 - .1850 14-20UNS #10 - .1935 1/4&q

4、uot;-20UNC #7 13/64" .2010 14-24UNS #7 - .2010 M6×1.00 5.2mm - .2047 1/4"-24UNS #4 - .2090 1/4"-28UNF #3 7/32" .2130 1/4"-32NEF 7/32" 7/32" .2188 1/4"-40UNS #1 - .2280 M7×1.00 6.1mm 15/64" .2401 5/16"-18UNC 字母F 17/64" .2570 M8×1.2

5、5 6.9mm 17/64" .2716 5/16"-24UNF 字母I - .2720 M8×1.00 7.1mm - .2795 5/16"-32NEF 9/32" 9/32" .2812 M9×1.2 7.9mm - .3110 3/8"-16UNC 5/16" 5/16" .3125 M9×0.75 8.3mm - .3268 M9×1.00 8.1mm - .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

6、"-24UNF 字母Q 21/64" .3320 M10×1.50 8.7mm - .3425 M10×1.25 8.9mm 11/32" .3503 M10×1.00* 9.1mm - .3583 7/16"-14UNC 字母U 23/64" .3680 M11×1.50 9.7mm - .3818 7/16"-20UNF 25/64" 25/64" .3906 M12×1.75 10.5mm - .4133 M12×1.50 10.7mm 27/64&

7、quot; .4212 1/2"-13UNC 27/64" 27/64" .4219 M12×1.25* 10.9mm 27/64" .4291 1/2"-20UNF 29/64" 29/64" .4531 1/2"-24UNS 29/64" 29/64" .4531 M14×2.00 12.2mm - .4803 9/16"-12UNC 31/64" 31/64" .4844 M14×1.50 12.7mm - .4999 M14&#

8、215;1.25* 12.8mm - .5039 9/16"-18UNF 33/64" 33/64" .5156 5/8"-11UNC 17/32" 17/32" .5312 M16×2.00 14.2mm 35/64" .5590 5/8"-18UNF 37/64" 37/64" .5781 M16×1.50 14.7mm - .5787 11/16"-11UNS 19/32" 19/32" .5938 M18×2.50 15.8mm

9、 39/64" .5220 11/16"-16UNS 5/8" 5/8" .6250 3/4"-10UNC 21/32" 21/32" .6562 M18×1.50* 16.8mm - .6614 3/4"-16UNF 11/16" 11/16" .6875 M20×2.50 17.8mm 11/16" .7008 7/8"-9UNC 49/64" 49/64" .7656 7/8"-14UNF 13/16" 13/

10、16" .8125 M22×1.50 20.9mm - .8228 7/8"-18UNS* 53/64" 53/64" .8281 M24×3.00 21.4mm 53/64" .8425 1"-8UNC 7/8" 7/8" .8750 M24×2.00 22.3mm - .8779 1"-12UNF 59/64" 59/64" .9219 1"-14UNS 15/16" 15/16" .9375 11/8"-7 U

11、NC 63/64" 63/64" .9844 11/8"-12 UNF 13/64" 13/64" 1.0469 11/4"-7 UNC 17/64" 17/64" 1.1094 11/4"-12 UNF 111/64" 111/64" 1.1719 13/8"-6 UNC 17/32" 17/32" 1.2188 13/8"-12 UNF 119/64" 119/64" 1.2969 11/2"-6 UNC 111

12、/32" 111/32" 1.3438 11/2"-12 UNF 127/64" 127/64" 1.4219 NPT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 - .3390 1/4"-18NPT 7/16" 7/16" .4375 3/8"-18NPT 37/64" 37/64" .5781 1/2"-14NPT 45/64" 45/64" .7031 3/4"-14NPT 59/64" 59/64" .9219 1"-11½ NPT 15/32" 1