Tap & Clearance Drill Sizes
Our tap and clearance drill charts are available as an Adobe Acrobat PDF file. You can print this file to use in your shop. To download the file, right-click the link below and choose Save Target As or Save Link As.
| Screw Size | Major Diameter |
Threads Per Inch |
Minor Diameter |
Tap Drill | Clearance Drill | ||||||
| 75% Thread for Aluminum, Brass, & Plastics |
50% Thread for Steel, Stainless, & Iron |
Close Fit | Free Fit | ||||||||
| Drill Size |
Decimal Equiv. |
Drill Size |
Decimal Equiv. |
Drill Size |
Decimal Equiv. |
Drill Size |
Decimal Equiv. |
||||
| 0 | .0600 | 80 | .0447 | 3/64 | .0469 | 55 | .0520 | 52 | .0635 | 50 | .0700 |
| 1 | .0730 | 64 | .0538 | 53 | .0595 | 1/16 | .0625 | 48 | .0760 | 46 | .0810 |
| 72 | .0560 | 53 | .0595 | 52 | .0635 | ||||||
| 2 | .0860 | 56 | .0641 | 50 | .0700 | 49 | .0730 | 43 | .0890 | 41 | .0960 |
| 64 | .0668 | 50 | .0700 | 48 | .0760 | ||||||
| 3 | .0990 | 48 | .0734 | 47 | .0785 | 44 | .0860 | 37 | .1040 | 35 | .1100 |
| 56 | .0771 | 45 | .0820 | 43 | .0890 | ||||||
| 4 | .1120 | 40 | .0813 | 43 | .0890 | 41 | .0960 | 32 | .1160 | 30 | .1285 |
| 48 | .0864 | 42 | .0935 | 40 | .0980 | ||||||
| 5 | .125 | 40 | .0943 | 38 | .1015 | 7/64 | .1094 | 30 | .1285 | 29 | .1360 |
| 44 | .0971 | 37 | .1040 | 35 | .1100 | ||||||
| 6 | .138 | 32 | .0997 | 36 | .1065 | 32 | .1160 | 27 | .1440 | 25 | .1495 |
| 40 | .1073 | 33 | .1130 | 31 | .1200 | ||||||
| 8 | .1640 | 32 | .1257 | 29 | .1360 | 27 | .1440 | 18 | .1695 | 16 | .1770 |
| 36 | .1299 | 29 | .1360 | 26 | .1470 | ||||||
| 10 | .1900 | 24 | .1389 | 25 | .1495 | 20 | .1610 | 9 | .1960 | 7 | .2010 |
| 32 | .1517 | 21 | .1590 | 18 | .1695 | ||||||
| 12 | .2160 | 24 | .1649 | 16 | .1770 | 12 | .1890 | 2 | .2210 | 1 | .2280 |
| 28 | .1722 | 14 | .1820 | 10 | .1935 | ||||||
| 32 | .1777 | 13 | .1850 | 9 | .1960 | ||||||
| 1/4 | .2500 | 20 | .1887 | 7 | .2010 | 7/32 | .2188 | F | .2570 | H | .2660 |
| 28 | .2062 | 3 | .2130 | 1 | .2280 | ||||||
| 32 | .2117 | 7/32 | .2188 | 1 | .2280 | ||||||
| 5/16 | .3125 | 18 | .2443 | F | .2570 | J | .2770 | P | .3230 | Q | .3320 |
| 24 | .2614 | I | .2720 | 9/32 | .2812 | ||||||
| 32 | .2742 | 9/32 | .2812 | L | .2900 | ||||||
| 3/8 | .3750 | 16 | .2983 | 5/16 | .3125 | Q | .3320 | W | .3860 | X | .3970 |
| 24 | .3239 | Q | .3320 | S | .3480 | ||||||
| 32 | .3367 | 11/32 | .3438 | T | .3580 | ||||||
| 7/16 | .4375 | 14 | .3499 | U | .3680 | 25/64 | .3906 | 29/64 | .4531 | 15/32 | .4687 |
| 20 | .3762 | 25/64 | .3906 | 13/32 | .4062 | ||||||
| 28 | .3937 | Y | .4040 | Z | .4130 | ||||||
| 1/2 | .5000 | 13 | .4056 | 27/64 | .4219 | 29/64 | .4531 | 33/64 | .5156 | 17/32 | .5312 |
| 20 | .4387 | 29/64 | .4531 | 15/32 | .4688 | ||||||
| 28 | .4562 | 15/32 | .4688 | 15/32 | .4688 | ||||||
| 9/16 | .5625 | 12 | .4603 | 31/64 | .4844 | 33/64 | .5156 | 37/64 | .5781 | 19/32 | .5938 |
| 18 | .4943 | 33/64 | .5156 | 17/32 | .5312 | ||||||
| 24 | .5114 | 33/64 | .5156 | 17/32 | .5312 | ||||||
| 5/8 | .6250 | 11 | .5135 | 17/32 | .5312 | 9/16 | .5625 | 41/64 | .6406 | 21/32 | .6562 |
| 18 | .5568 | 37/64 | .5781 | 19/32 | .5938 | ||||||
| 24 | .5739 | 37/64 | .5781 | 19/32 | .5938 | ||||||
| 11/16 | .6875 | 24 | .6364 | 41/64 | .6406 | 21/32 | .6562 | 45/64 | .7031 | 23/32 | .7188 |
| 3/4 | .7500 | 10 | .6273 | 21/32 | .6562 | 11/16 | .6875 | 49/64 | .7656 | 25/32 | .7812 |
| 16 | .6733 | 11/16 | .6875 | 45/64 | .7031 | ||||||
| 20 | .6887 | 45/64 | .7031 | 23/32 | .7188 | ||||||
| 13/16 | .8125 | 20 | .7512 | 49/64 | .7656 | 25/32 | .7812 | 53/64 | .8281 | 27/32 | .8438 |
| 7/8 | .8750 | 9 | .7387 | 49/64 | .7656 | 51/64 | .7969 | 57/64 | .8906 | 29/32 | .9062 |
| 14 | .7874 | 13/16 | .8125 | 53/64 | .8281 | ||||||
| 20 | .8137 | 53/64 | .8281 | 27/32 | .8438 | ||||||
| 15/16 | .9375 | 20 | .8762 | 57/64 | .8906 | 29/32 | .9062 | 61/64 | .9531 | 31/32 | .9688 |
| 1 | 1.000 | 8 | .8466 | 7/8 | .8750 | 59/64 | .9219 | 1-1/64 | 1.0156 | 1-1/32 | 1.0313 |
| 12 | .8978 | 15/16 | .9375 | 61/64 | .9531 | ||||||
| 20 | .9387 | 61/64 | .9531 | 31/32 | .9688 | ||||||