ISO Metric Coarse
| Size (mm) |
Pitch (mm) |
Drill (mm) |
| M1 |
.25 |
.75 |
| M1.1 |
.25 |
.85 |
| M1.2 |
.25 |
.95 |
| M1.4 |
.3 |
1.1 |
| M1.6 |
.35 |
1.25 |
| M1.8 |
.35 |
1.45 |
| M2 |
.4 |
1.6 |
| M2.2 |
.45 |
1.75 |
| M2.5 |
.45 |
2.05 |
| M3 |
.5 |
2.5 |
| M3.5 |
.6 |
2.9 |
| M4 |
.7 |
3.3 |
| M4.5 |
.75 |
3.75 |
| M5 |
.8 |
4.2 |
| M6 |
1 |
5 |
| M7 |
1 |
6 |
| M8 |
1.25 |
6.75 |
| M9 |
1.25 |
7.75 |
| M10 |
1.5 |
8.5 |
| M11 |
1.5 |
9.5 |
| M12 |
1.75 |
10.2 |
| M14 |
2 |
12 |
| M16 |
2 |
14 |
| M18 |
2.5 |
15.5 |
| M20 |
2.5 |
17.5 |
| M22 |
2.5 |
19.5 |
| M24 |
3 |
21 |
| M27 |
3 |
24 |
| M30 |
3.5 |
26.5 |
| M33 |
3.5 |
29.5 |
| M36 |
4 |
32 |
| M39 |
4 |
35 |
| M42 |
4.5 |
37.5 |
| M45 |
4.5 |
40.5 |
| M48 |
5 |
43 |
| M52 |
5 |
47 |
| M56 |
5.5 |
50.5 |
| M60 |
5.5 |
54.5 |
| M64 |
6 |
58 |
| M68 |
6 |
62 |
| M72 |
6 |
66 |
| M76 |
6 |
70 |
UNC
Size No.
or inch |
Pitch
TPI |
Drill (mm) |
| #1 |
64 |
1.55 |
| #2 |
56 |
1.85 |
| #3 |
48 |
2.1 |
| #4 |
40 |
2.35 |
| #5 |
40 |
2.65 |
| #6 |
32 |
2.85 |
| #8 |
32 |
3.5 |
| #10 |
24 |
3.9 |
| #12 |
24 |
4.5 |
| 1/4 |
20 |
5.1 |
| 5/16 |
18 |
6.6 |
| 3/8 |
16 |
8 |
| 7/16 |
14 |
9.4 |
| 1/2 |
13 |
10.8 |
| 9/16 |
12 |
12.2 |
| 5/8 |
11 |
13.5 |
| 3/4 |
10 |
16.5 |
| 7/8 |
9 |
19.5 |
| 1 |
8 |
22.25 |
| 1 1/8 |
7 |
25 |
| 1 1/4 |
7 |
28 |
| 1 3/8 |
6 |
30.75 |
| 1 1/2 |
6 |
34 |
| 1 3/4 |
5 |
39.5 |
| 2 |
4.5 |
45 |
| 2 1/4 |
4.5 |
51.5 |
| 2 1/2 |
4 |
57.25 |
| 2 3/4 |
4 |
63.5 |
| 3 |
4 |
70 |
UNF
Size No.
or inch |
Pitch
TPI |
Drill (mm) |
| #0 |
80 |
1.25 |
| #1 |
72 |
1.55 |
| #2 |
64 |
1.9 |
| #3 |
56 |
2.15 |
| #4 |
48 |
2.4 |
| #5 |
44 |
2.7 |
| #6 |
40 |
2.95 |
| #8 |
36 |
3.5 |
| #10 |
32 |
4.1 |
| #12 |
28 |
4.7 |
| 1/4 |
28 |
5.5 |
| 5/16 |
24 |
6.9 |
| 3/8 |
24 |
8.5 |
| 7/16 |
20 |
9.9 |
| 1/2 |
20 |
11.5 |
| 9/16 |
18 |
12.9 |
| 5/8 |
18 |
14.5 |
| 3/4 |
16 |
17.5 |
| 7/8 |
14 |
20.4 |
| 1 |
12 |
23.25 |
| 1 1/8 |
12 |
26.5 |
| 1 1/4 |
12 |
29.5 |
| 1 3/8 |
12 |
32.75 |
| 1 1/2 |
12 |
36 |
|
ISO Metric Fine
| Size (mm) |
Pitch (mm) |
Drill (mm) |
| M2 |
.25 |
1.75 |
| M2.2 |
.25 |
1.95 |
| M2.3 |
.25 |
2.05 |
| M2.5 |
.35 |
2.15 |
| M2.6 |
.35 |
2.25 |
| M3 |
.35 |
2.65 |
| M3.5 |
.35 |
3.15 |
| M4 |
.35 |
3.65 |
| M4 |
.5 |
3.5 |
| M5 |
.35 |
4.65 |
| M5 |
.5 |
4.5 |
| M5 |
.75 |
4.25 |
| M5.5 |
.5 |
5 |
| M6 |
.5 |
5.5 |
| M6 |
.75 |
5.25 |
| M7 |
.75 |
6.25 |
| M8 |
.5 |
7.5 |
| M8 |
.75 |
7.25 |
| M8 |
1 |
7 |
| M9 |
.75 |
8.25 |
| M9 |
1 |
8 |
| M10 |
.5 |
9.5 |
| M10 |
.75 |
9.25 |
| M10 |
1 |
9 |
| M10 |
1.25 |
8.75 |
| M11 |
.75 |
10.25 |
| M11 |
1 |
10 |
| M11 |
1.25 |
9.75 |
| M12 |
.5 |
11.5 |
| M12 |
.75 |
11.25 |
| M12 |
1 |
11 |
| M12 |
1.25 |
10.75 |
| M12 |
1.5 |
10.5 |
| M14 |
1 |
13 |
| M14 |
1.25 |
12.75 |
| M14 |
1.5 |
12.5 |
| M15 |
.75 |
14.25 |
| M15 |
1 |
14 |
| M15 |
1.5 |
13.5 |
| M16 |
.5 |
15.5 |
| M16 |
.75 |
15.25 |
| M16 |
1 |
15 |
| M16 |
1.25 |
14.75 |
| M16 |
1.5 |
14.5 |
| M17 |
1 |
16 |
| M17 |
1.5 |
15.5 |
| M18 |
.75 |
17.25 |
| M18 |
1 |
17 |
| M18 |
1.25 |
16.75 |
| M18 |
1.5 |
16.5 |
| M18 |
2 |
16 |
| M19 |
1 |
18 |
| M20 |
1 |
19 |
| M20 |
1.5 |
18.5 |
| M20 |
2 |
18 |
| M22 |
1 |
21 |
| M22 |
1.5 |
20.5 |
| M22 |
2 |
20 |
| M24 |
1 |
23 |
| M24 |
1.5 |
22.5 |
| M24 |
2 |
22 |
| M25 |
1 |
24 |
| M25 |
1.5 |
23.5 |
| M25 |
2 |
23 |
| M27 |
1 |
26 |
| M27 |
1.5 |
25.5 |
| M27 |
2 |
25 |
| M28 |
1 |
27 |
| M28 |
1.5 |
26.5 |
| M28 |
2 |
26 |
| M30 |
1 |
29 |
| M30 |
1.5 |
28.5 |
| M30 |
2 |
28 |
| M30 |
3 |
27 |
| M32 |
1 |
31 |
| M32 |
1.5 |
30.5 |
| M32 |
2 |
30 |
| M33 |
1.5 |
31.5 |
| M33 |
2 |
31 |
| M33 |
3 |
30 |
| M35 |
1.5 |
33.5 |
| M35 |
2 |
33 |
| M35 |
3 |
32 |
| M36 |
1 |
35 |
| M36 |
1.5 |
34.4 |
| M36 |
2 |
34 |
| M36 |
3 |
33 |
| M38 |
1 |
37 |
| M38 |
1.5 |
36.5 |
| M38 |
2 |
36 |
| M39 |
1.5 |
37.5 |
| M39 |
2 |
37 |
| M39 |
3 |
36 |
| M40 |
1 |
39 |
| M40 |
1.5 |
38.5 |
| M40 |
3 |
37 |
| M42 |
1.5 |
40.5 |
| M42 |
2 |
40 |
| M42 |
3 |
39 |
| M42 |
4 |
38 |
| M45 |
1.5 |
43.5 |
| M45 |
2 |
43 |
| M45 |
3 |
42 |
| M48 |
1.5 |
46.5 |
| M48 |
2 |
46 |
| M48 |
3 |
45 |
| M48 |
4 |
44 |
| M50 |
1.5 |
48.5 |
| M50 |
2 |
48 |
| M50 |
3 |
47 |
| M52 |
1.5 |
50.5 |
| M52 |
2 |
50 |
| M52 |
3 |
49 |
| M52 |
4 |
48 |
| M56 |
2 |
54 |
| M56 |
4 |
52 |
|
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