| THREADSIZE | DRILL DIAMETER
Coarse Thread |
TAP DRILLSIZE |
| 1-64 | .0595 | No. 53 |
| 2-56 | .0700 | No. 50 |
| 3-48 | .0785 | No. 47 |
| 4-40 | .0890 | No. 43 |
| 5-40 | .1015 | No. 38 |
| 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 |
Ronnie Collins
I’m Ronnie Collins. I’ve been passionate about gardening and woodworking all my life and even earned an MS degree in Botany from the University of Maryland. I’ve been working at a gardening company for a while, so I know the ropes about a whole lot of dedicated equipment such as the table saw, track saw, lawnmowers, chainsaws, garden hoses, and much more.
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