Metric Tap Drill Chart
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1
2Metric Tap &
Tap Drill
Clearance Drill
75% Thread for
50% Thread for
Clearance Drill
Aluminum, Brass,
Steel, Stainless,
Close Fit
Standard Fit
Sizes
& Plastics
& Iron
Closest
Closest
Closest
Closest
Screw Size
Thread
Drill Size
Drill Size
Drill Size
Drill Size
American
American
American
American
(mm)
Pitch (mm)
(mm)
(mm)
(mm)
(mm)
Drill
Drill
Drill
Drill
M1.5
0.35
1.15
56
1.25
55
1.60
1/16
1.65
52
M1.6
0.35
1.25
55
1.35
54
1.70
51
1.75
50
M 1.8
0.35
1.45
53
1.55
1/16
1.90
49
2.00
5/64
0.45
1.55
1/16
1.70
51
M 2
2.10
45
2.20
44
0.40
1.60
52
1.75
50
M 2.2
0.45
1.75
50
1.90
48
2.30
3/32
2.40
41
M 2.5
0.45
2.05
46
2.20
44
2.65
37
2.75
7/64
0.60
2.40
41
2.60
37
M 3
3.15
1/8
3.30
30
0.50
2.50
39
2.70
36
M 3.5
0.60
2.90
32
3.10
31
3.70
27
3.85
24
0.75
3.25
30
3.50
28
M 4
4.20
19
4.40
17
0.70
3.30
30
3.50
28
M 4.5
0.75
3.75
25
4.00
22
4.75
13
5.00
9
1.00
4.00
21
4.40
11/64
M 5
0.90
4.10
20
4.40
17
5.25
5
5.50
7/32
0.80
4.20
19
4.50
16
M 5.5
0.90
4.60
14
4.90
10
5.80
1
6.10
B
1.00
5.00
8
5.40
4
M 6
6.30
E
6.60
G
0.75
5.25
4
5.50
7/32
1.00
6.00
B
6.40
E
M 7
7.40
L
7.70
N
0.75
6.25
D
6.50
F
1.25
6.80
H
7.20
J
M 8
8.40
Q
8.80
S
1.00
7.00
J
7.40
L
1.25
7.80
N
8.20
P
M 9
9.50
3/8
9.90
25/64
1.00
8.00
O
8.40
21/64
1.50
8.50
R
9.00
T
M 10
1.25
8.80
11/32
9.20
23/64
10.50
Z
11.00
7/16
1.00
9.00
T
9.40
U
M 11
1.50
9.50
3/8
10.00
X
11.60
29/64
12.10
15/32
1.75
10.30
13/32
10.90
27/64
M 12
1.50
10.50
Z
11.00
7/16
12.60
1/2
13.20
33/64
1.25
10.80
27/64
11.20
7/16
2.00
12.10
15/32
12.70
1/2
M 14
14.75
37/64
15.50
39/64
1.50
12.50
1/2
13.00
33/64
1.25
12.80
1/2
13.20
33/64
M 15
1.50
13.50
17/32
14.00
35/64
15.75
5/8
16.50
21/32
2.00
14.00
35/64
14.75
37/64
M 16
16.75
21/32
17.50
11/16
1.50
14.50
37/64
15.00
19/32
M 17
1.50
15.50
39/64
16.00
5/8
18.00
45/64
18.50
47/64
2.50
15.50
39/64
16.50
41/64
M 18
2.00
16.00
5/8
16.75
21/32
19.00
3/4
20.00
25/32
1.50
16.50
21/32
17.00
43/64
M 19
2.50
16.50
21/32
17.50
11/16
20.00
25/32
21.00
53/64
2.50
17.50
11/16
18.50
23/32
M 20
2.00
18.00
45/64
18.50
47/64
21.00
53/64
22.00
55/64
1.50
18.50
47/64
19.00
3/4
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