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General-use Metric Thread (Total System) (Size Selected for Screw Components)

Nominal diameter and pitch selection (excerpt from JIS B 0205-2:2001)

Unit: mm

Nominal diameter D, d Pitch P
Column 1 Column 2 Column 3 Coarse Fine
First choice Second choice Third choice 4 3 2 1.5 1.25 1 0.75 0.5 0.35 0.25 0.2
1 0.25                     0.2

1.2
1.1

1.4


0.25
0.25
0.3
                    0.2
0.2
0.2
1.6

2

1.8


0.35
0.35
0.4
                   
 
0.25
0.2
0.2
 

2.5
3
2.2



0.45
0.45
0.5
                 
0.35
0.35
0.25
 
 
 

4
3.5

4.5


0.6
0.7
0.75
               
0.5
0.5
0.35
 
 
   
5

6



5.5
0.8
 
1
             
 
0.75
0.5
0.5
 
     

8
7



9
1
1.25
1.25
           
1
1
0.75
0.75
0.75
       
10

12



11
1.5
1.5
1.75
       
 
1.5
1.25
 
1.25
1
1
1
0.75
0.75
 
       


16
14


15
2
 
2
      1.5
1.5
1.5
1.25 (1)
 
 
1
1
1
         


20

18
17

 
2.5
2.5
     
2
2
1.5
1.5
1.5
  1
1
1
         

24
22



25
2.5
3
 
    2
2
2
1.5
1.5
1.5
  1
1
1
         



27
26

28
 
3
 
     
2
2
1.5
1.5
1.5
   
1
1
         
30



33

32
3.5
 
3.5
  (3)
 
(3)
2
2
2
1.5
1.5
1.5
  1
 
 
         

36




39
35 (2)

38
 
4
 
4
   
3
 
3
 
2
 
2
1.5
1.5
1.5
1.5
             

42


45
40

 
4.5
4.5
 
4
4
3
3
3
2
2
2
1.5
1.5
1.5
             
48



52

50
5
 
5
4
 
4
3
3
3
2
2
2
1.5
1.5
1.5
             

56


55

58
 
5.5
 
4
4
4
3
3
3
2
2
2
1.5
1.5
1.5
             
60 5.5 4 3 2 1.5              

Notes

  • (1) Can only be used for spark plugs in internal combustion engines.
  • (2) Can only be used to fix rolling-element bearings.
  • *Select the nominal diameter in column 1 as maximum priority. If necessary, select column 2, and then column 3.
  • *Pitches shown in brackets should, where possible, be avoided.

Size selected for screw components (excerpt from JIS B 0205-3:2001)

Unit: mm

Nominal diameter D, d Pitch P
First choice Second choice Coarse Fine
1 0.25
1.2 0.25
1.4 0.25
1.6 0.35
1.8 0.35
2 0.4
2.5 0.45
3 0.5
3.5 0.6
4 0.7
5 0.8
6 1
7 1
8 1.25 1
10 1.5 1.25 1
12 1.75 1.5 1.25
14 2 1.5
16 2 1.5
18 2.5 2 1.5
20 2.5 2 1.5
22 2.5 2 1.5
24 3 2
27 3 2
30 3.5 2
33 3.5 2
36 4 3
39 4 3
42 4.5 3
45 4.5 3
48 5 3
52 5 4
56 5.5 4
60 5.5 4

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