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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