AccuThread - Allied Maxcut Engineering - #19

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® 17 AccuThread 856® Thread Specification and Drill Chart Based on nominal tap drill diameter. Based on .003” or 0.075mm probable mean oversize. To calculate percent of full thread for a given hole diameter % Thread = # of Threads per Inch * Basic Major Diameter Drill Hole Of thread (inch) - Size (inch) .0130 2-56 50 - 0.0700 3-56 45 - 0.0820 4-40 43 3/32” 0.0890 ¼-40 38 - 0.1015 5-40 38 - 0.1015 6-40 33 - 0.1130 M4x0.7 3.4mm - 0.133 M4x0.75 3.4mm - 0.1338 8-32 29 - 0.1360 8-40 28 - 0.1405 3/16-24 26 - 0.1470 10-24 25 5/32” 0.1495 3/16-32 22 - 0.1570 10-32 21 5/32” 0.1590 M5-0.8 4.2mm - 0.1653 M5-0.9 4.3mm - 0.1693 12-24 16 11/64” 0.1770 12-28 14 3/16” 0.1820 12-32 13 - 0.1850 14-20 10 - 0.1935 ¼-20 7 13/64” 0.2010 14-24 7 - 0.2010 M6-1.0 5.2mm - 0.2047 ¼-24 4 - 02090 ¼-28 3 7/32” 0.2130 ¼-32 7/32” 7/32” 0.2188 ¼-40 1 - 0.2280 M7-1.0 6.1mm 15/64” 0.2401 5/16-18 F 17/64” 0.2570 M8-1.25 6.9mm 17/64” 0.2716 5/16-24 I - 0.2720 M8-1.0 7.1mm - 0.2795 5/16-32 9/32” 9/32” 0.2812 M9-1.25 7.9mm - 0.3110 3/8-16 5/16” 5/16” 0.3125 M9-1.0 8.1mm - 0.3189 M9-0.75 8.3mm - 0.3268 3/8-24 Q 21/64” 0.3320 M10-1.5 8.7mm - 0.3425 M10-1.25 8.9mm 11/32” 0.3503 M10-1.0 9.1mm - 0.3583 7/16-14 U 23/64” 0.3680 M11-1.5 9.7mm - 0.3818 7/16-20 25/64” 25/64” 0.3906 M12-1.75 10.5mm - 0.4133 M12-1.5 10.7mm 27/64” 0.4212 ½-13 27/64” 27/64” 0.4291 M12-1.25 10.9mm 27/64” 0.4291 Thread Specification Uses this drill Closest Fraction Decimal Inches ½-20 29/64” 29/64” 0.4531 ½-24 29/64” 29/64” 0.4531 M14-2.0 12.2mm - 0.4803 9/16-12 31/64” 31/64” 0.4844 M14-1.5 12.7mm - 0.4999 M14-1.25 12.8mm - 0.5039 9/16-18 33/64” 33/64” 0.5156 5/8-11 17/32” 17/32” 0.5312 M16-2.0 14.2mm 35/64” 0.5590 5/8-18 37/64” 37/64” 0.5781 M16-1.5 14.7mm - 0.5787 11/16-11 19/32” 19/32” 0.5938 M18-2.5 15.8mm 39/64” 0.5220 11/16-16 5/8” 5/8” 0.6250 3/4-10 21/32” 21/32” 0.6562 M18-1.5 16.8mm - 0.6614 3/4-16 11/16” 11/16” 0.6875 M20-2.5 17.8mm 11/16” 0.7008 7/8-9 49/64” 49/64” 0.7656 7/8-14 13/16” 13/16” 0.8125 M22-1.5 20.9mm - 0.8228 7/8-18 53/64” 53/64” 0.8281 M24-3.0 21.4mm 53/64” 0.8425 1-8 7/8” 7/8” 0.8750 M24-2.0 22.3mm - 0.8779 1-12 59/64” 59/64” 0.9219 1-14 15/16” 15/16” 0.9375 1-1/8-7 63/64” 63/64” 0.9844 1-1/8-12 1-3/64” 1-3/64” 1.0469 1-1/4-7 1-7/64” 1-7/64” 1.1094 1-1/4-12 1-11/64” 1-11/64” 1.1719 1-3/8-6 1-7/32” 1-7/32” 1.2188 1-3/8-12 1-19/64” 1-19/64” 1.2969 1-1/2-6 1-11/32” 1-11/32” 1.3438 1-1/2-12 1-27/64” 1-27/4” 1.4219 Thread Specification Uses this drill Closest Fraction Decimal Inches 1/8-27 NPT R - 0.3390 ¼-18 NPT 7/16” 7/16” 0.4375 3/8-18 NPT 37/64” 37/64” 0.5781 ½-14 NPT 45-64” 45/64” 0.7031 ¾-14 NPT 59/64” 59/64” 0.9219 1-11-1/2 NPT 1-5/32” 1-5/32” 1.1562 1-1/4-11.5 NPT 1-1/2” 1-1/2” 1.5000 1-1/2-11.5 NPT 1-47/64” 1-47/64” 1.7344 2-11.5 NPT 2-7/32” 2-7/32” 2.2188 Thread Specification Uses this drill Closest Fraction Decimal Inches Major Thread Diameter for # Drills % Thread = 76.93 Pitch (mm) * Basic Major Diameter Drill Hole Of thread (mm) - Size (mm)