Tap Drill Size For Standard Threats
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1
2Tap Drill Size Chart for Standard Threads
American Standard Thread
ISO Metric Thread
......
Thread Size Tap Drill Size (in.)
Thread Size Tap Drill Size(mm)
0-80
3/64
M1 x 0.25
0.75
1-64
53
M1.1 x 0.25
0.85
1-72
53
M1.2 x 0.25
0.95
2-56
51
M1.4 x 0.3
1.10
2-64
50
M1.6 x 0.35
1.25
3-48
5/64
M1.8 x 0.35
1.45
3-56
46
M2 x 0.4
1.60
4-40
43
M2.2 x 0.45
1.75
4-48
42
M2.5 x 0.45
2.05
5-40
39
M3 x 0.5
2.50
Thread Size Tap Drill Size (in.)
Thread Size Tap Drill Size(mm)
......
5-44
37
M3.5 x 0.6
2.90
6-32
36
M4 x 0.7
3.30
6-40
33
M4.5 x 0.75
3.70
8-32
29
M5 x 0.8
4.20
8-36
29
M6 x 1
5.00
10-24
25
M7 x 1
6.00
10-32
21
M8 x 1.25
6.80
12-24
17
M9 x 1.25
7.80
12-28
15
M10 x 1.5
8.50
1/4-20
7
M11 x 1.5
9.50
Thread Size Tap Drill Size (in.)
Thread Size Tap Drill Size(mm)
......
1/4-28
3
M12 x 1.75
10.20
5/16-18
F
M14 x 2
12.00
5/16-24
I
M16 x 2
14.00
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