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Tap & Drill Chart
tap size hole size drill size 6-32 | .1065 | No. 36 | 8-32 | .1360 | No. 29 | 10-24 | .1495 | No. 25 | 12-24 | .1770 | No. 16 | 1/4-20 | .2010 | No. 7 | 5/16-18 | .2570 | 'F' | 3/8-16 | .3125 | 5/16 | 7/16-14 | .3680 | 'U' | 1/2-13 | .4219 | 27/64 | 9/16-12 | .4844 | 31/64 | 5/8-11 | .5312 | 17/32 | 3/4-10 | .6562 | 21/32 | 7/8-9 | .7656 | 49/64 | 1"-8 | .8750 | 7/8 | Fine Thread | 0-80 | .0469 | 3/64 | 1-72 | .0595 | No. 53 | 2-64 | .0700 | No. 50 | 3-56 | .0820 | No. 45 | 4-48 | .0935 | No. 42 | 5-44 | .1040 | No. 37 | 6-40 | .1130 | No. 33 | 8-36 | .1360 | No. 29 | 10-32 | .1590 | No. 21 | 12-28 | .1820 | No. 14 | 1/4-28 | .2130 | No. 3 | 5/16-24 | .2720 | 'I' | 3/8-24 | .3320 | 'Q' | 7/16-20 | .3906 | 25/64 | 1/2-20 | .4531 | 29/64 | 9/16-18 | .5156 | 33/64 | 5/8-18 | .5781 | 37/64 | 3/4-16 | .6875 | 11/16 | 7/8-14 | .8125 | 13/16 | 1"-14 | .9375 | 59/64 |
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