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Tap Drill Sizes

Based on Approximately 75% Full Thread

Fractional
Sizes

Drill

Machine
Screw
Sizes

Drill
1/64-64
3/64
0-80
3/64
5/64-60
1/16
1-56
54
3/32-48
49
1-64
53
7/64-48
43
1-72
53
1/8/-32
3/32
2-56
50
1/8/-40
38
2-64
50
9/64-40
32
3-48
47
5/32-32
1/8
3-56
45
11/64-32
9/64
4-32
45
3/16-24
26
4-36
44
3/16-32
22
4-40
43
13/64-24
20
4-48
42
7/32-24
16
5-36
40
15/64-24
10
5-40
38
1/4-20
7
5-44
37
1/4-20
3
6-32
36
5/16-18
F
6-36
34
5/16-24
I
6-40
33
3/8-16
5/16
7-30
31
3/8-24
Q
7-32
31
7/16-14
U
7-36
118
7/16-20
25/64
8-30
30
1/2-12
27/64
8-32
29
1/2-13
27/64
8-36
29
1/2-20
29/64
8-40
28
9/16-12
31/64
9-24
29
9/16-18
33/64
9-30
27
5/8-11
17/32
9-32
26
5/8-18
37/64
10-24
25
11/16-11
19/32
10-28
23
11/16-16
5/8
10-30
22
3/4-10
21/32
10-32
21
3/4-16
11/16
12-24
16
13/16-10
23/32
12-28
14
7/8-9
49/64
12-32
13
7/8-14
13/16
14-20
10
15/16-9
53/64
14-24
7
1-8
7/8

Metric Sizes

mm. Drill
1-14
15/16
1-1/8-7
63/64
2x.4
1.6
1-1/8-12
1-3/64
2.5x.45
2.0
1-1/4-7
1-7/64
3x.5
2.5
1-1/4-12
1-11/64
3.5x.6
2.9
1-3/8-6
1-13/64
4x7
3.3
1-3/8-12
1-18/64
4.5x.75
3.75
1-1/2-6
1-11/32
5x.8
4.2
1-1/2-12
1-27/64
6x1.0
5.0
1-5/8-5-1/2
1-28/64
7x1.0
6.0
1-3/4-5
1-9/16
8x1.25
6.8
1-7/8-5
1-11/16
9x1.25
7.8
2-4-1/2
1-25/32
10x1.5
8.6

Pipe Thread
Size

Drill
11 x 1.5
9.6
12x1.75
10.5
1/8-27
11/32
14x2.0
12.0
1/4-18
7/16
16x2.0
14.0
3/8-18
37/64
18x2.5
15.5
1/2-14
23/32
20x2.5
17.5
3/4-14
59/64
22x2.5
19.5
1-11-1/2
11693
24x3.0
21.0
1-1/4-11-1/2
1-1/2
30x3.5
26.5
2-11-1/2
2-7/32
36x4.0
32.0
3-8
3-1/4
  
3-1/2-8
3-3/4
4-8
4-1/4