| Machine Screw Size |
Threads Per Inch |
Minor Dia |
Tap Drills | Clearance Hole Drills | |||||||
| Alum, Brass, & Plasitcs75% Thread |
Stainless Steel, Steels & Iron50% Thread |
All Materials | |||||||||
| Close Fit | Free Fit | ||||||||||
| # or Dia | Major Dia |
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 | .6562 |
| 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 | ||||||
