TAP AND DRILL SIZE CHART

THREAD
SIZE
DRILL
DIAMETER
Coarse Thread
TAP DRILL
SIZE
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
 


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