Tap Drill Chart Standard Machine Screws
New Page 1This tap drill chart is for Standard size taps. Both NC & NF Drill size recommendations are for 70-75% thread height. Drills produce a hole slightly larger then their normal size. Size obtained will depend on drill style, condition etc. You can find a easy to use formula for calculating standard Tap drill sizes on our Math Tricks Page
Tap Size | Tap Size & Pitch | Drill Size | Decimal | Tap Size & Pitch | Drill Size | Decimal | | 1/4-20 | # 7 | .2010 | 3/4-10 | 21/32 | .6562 | | 1/4-28 | # 3 | .2130 | 3/4-16 | 11/16 | .6875 | | 5/16-18 | F | .2570 | 7/8-9 | 49/64 | .7656 | | 5/16-24 | I | .2720 | 7/8-14 | 13/16 | .8125 | | 3/8-16 | 5/16 | .3125 | 1-8 | 7/8 | .8750 | | 3/8-24 | Q | .3320 | 1-12 | 59/64 | .9219 | | 7/16-14 | U | .3680 | 1-1/8-7 | 63/64 | .9844 | | 7/16-20 | 25/64 | .3906 | 1-1/8-12 | 1-3/64 | 1.0469 | | 1/2-13 | 27/64 | .4219 | 1-1/4-7 | 1-7/64 | 1.1094 | | 1/2-20 | 29/64 | .4531 | 1-1/4-12 | 1-11/64 | 1.1719 | | 9/16-12 | 31/64 | .4844 | 1-3/8-6 | 1-11/32 | 1.2188 | | 9/16-18 | 33/64 | .5156 | 1-3/8-12 | 1-19/64 | 1.2969 | | 5/8-11 | 17/32 | .5312 | 1-1/2-6 | 1-11/32 | 1.3438 | | 5/8-18 | 37/64 | .5781 | 1-1/2-12 | 1-27/64 | 1.4219 |
Standard
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