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Drill Tap Chart

SAE TAP DRILL SIZE - Coarse & Fine

Thread Size Drill Diameter (in)Drill Size
1-64 0.0595 No. 53
2-56 0.07 No. 50
3-48 0.0785 No. 47
4-40 0.089 No. 43
5-40 0.1015 No. 38
6-32 0.1065 No. 36
8-32 0.136 No. 29
10-24 0.1495 No. 25
12-24 0.177 No. 16
1/4-20 0.201 No. 7
5/16-18 0.257 'F'
3/8-16 0.3125 05/16/22
7/16-14 0.368 'U'
1/2-13 0.4219 27/64
9/16-12 0.4844 31/64
5/8-11 0.5312 17/32
3/4-10 0.6562 21/32
7/8-9 0.7656 49/64
1"-8 0.875 07/08/22
0-80 0.0469 3/64
1-72 0.0595 No. 53
2-64 0.07 No. 50
3-56 0.082 No. 45
4-48 0.0935 No. 42
5-44 0.104 No. 37
6-40 0.113 No. 33
8-36 0.136 No. 29
10-32 0.159 No. 21
12-28 0.182 No. 14
1/4-28 0.213 No. 3
5/16-24 0.272 'I'
3/8-24 0.332 'Q'
7/16-20 0.3906 25/64
1/2-20 0.4531 29/64
9/16-18 0.5156 33/64
5/8-18 0.5781 37/64
3/4-16 0.6875 11/16/22
7/8-14 0.8125 13/16
1"-14 0.9375 59/64

METRIC TAP DRILL SIZE - Coarse & Fine

Tap Size Drill Size
1 x .25 0.75
1.1 x .25 0.85
1.2 x .25 0.95
1.4 x .3 1.1
1.6 x .35 1.25
1.7 x .35 1.3
1.8 x .35 1.45
2 x .4 1.6
2.2 x .45 1.75
2.5 x .45 2.05
3 x .5 2.5
3.5 x .6 2.9
4 x .7 3.3
4.5 x .75 3.7
5 x .8 4.2
6 x 1 5
7 x 1 6
8 x 1.25 6.8
9 x 1.25 7.8
10 x 1.5 8.5
11 x 1.5 9.5
12 x 1.75 10.2
14 x 2 12
16 x 2 14
18 x 2.5 15.5
20 x 2.5 17.5
22 x 2.5 19.5
24 x 3 21
27 x 3 24
30 x 3.5 26.5
33 x 3.5 29.5
36 x 4 32
39 x 4 35
4 x .35 3.6
4 x .5 3.5
5 x .5 4.5
6 x .5 5.5
6 x .75 5.25
7 x .75 6.25
8 x .5 7.5
8 x .75 7.25
8 x 1 7
9 x 1 8
10 x .75 9.25
10 x 1 9
10 x 1.25 8.8
11 x 1 10
12 x .75 11.25
12 x 1 11
12 x 1.5 10.5
14 x 1 13
14 x 1.25 12.8
14 x 1.5 12.5
16 x 1 15
16 x 1.5 14.5
18 x 1 17
18 x 2 16
20 x 1 19
20 x 1.5 18.5
20 x 2 18
22 x 1 21
22 x 1.5 20.5
22 x 2 20
24 x 1.5 22.5
24 x 2 22
26 x 1.5 24.5
27 x 1.5 25.5
27 x 2 25
28 x 1.5 26.5
30 x 1.5 28.5
30 x 2 28
33 x 2 31
36 x 3 33
39 x 3 36