Technical Section
  Metric Thread Pitch Table
Preference Class Pitch Drill Size for
Tapping
M Coarse
Drill Size for
Tapping
M Fine
 1(1)  2(2) Coarse Fine
 1
1.2



1.4

.25
.25
.3
  .75
.95
1.1
 
1.6

2
1.8 .35
.35
.4
  1.25
1.4
1.6
 

2.5
3
2.2


.45
.45
.5
 

1.7
2.0
2.5

 

4
5
3.5


.6
.7
.8
 

2.9
3.3
4.2

 
6
8

1
1.25

1
5.0
6.8

7
10
12

 

1.5
1.75
1.25
1.25 (1.5)
8.5
10.2
8.8 (9.0)
10.8 (10.5)
14
16
14

2
2
1.5
1.5
12.0
14.0
12.5
14.5

20

18

22
2.5
2.5
2.5
1.5
1.5
1.5

15.5
17.5
19.5

16.5
18.5
20.5

24

3
2 21.0 22.0

30
27

3
3.5
2
2
24.0
26.5
25.0
28.0

36
33

3.5
4
2
3
29.5
32.0
31.0
33.0
42

48

45

4.5
4.5
5
3
3
3

37.5
40.5
43.0

39.0
42.0
45.0


56

52

60
5
5.5
5.5
3
4
4
47.0
50.5
54.5
49.0
52.0
56.0
64

72

68

6
6

4
4
6
58.0
62.0

60.0
64.0
66.0

80

76

85
  6
6
6
  70.0
74.0
79.0
90

100

95


6
6
6
 

84.0
89.0
94.0

 

   *All dimensions listed in millimeters
   (1) The fastener sizes in preference class 1 are suggested to be used in all designs. The sizes in this category are generally readily available.
   (2) Fasteners in preference class 2 should be chosen only if a size in preference class 1 is not feasible. For preference class 2 sizes, longer lead times should be expected.

 

 
To Limits for Metric (Standard) Coarse Threads (bolts)

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