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US Size
Dia. -inch
Dia. in MM
Metric -MM
British
French
German
Japan
Swiss
0000
.390
9.91
 
-
    
00
.422
10.72
 
-
    
0
.454
11.53
 
-
    
1/2
.474
11.95
 
A
    
3/4
.482
12.18
 
A 1/2
    
1
.487
12.37
38.9
B
  
1
 
1 1/4
-
12.60
39.6
B 1/2
    
1 1/2
.503
12.78
40.2
C
    
1 3/4
-
13.00
40.8
C 1/2
    
2
.520
13.21
41.5
D
41 1/2
13 1/2
2
1 1/2
2 1/4
-
13.41
42.1
D 1/2
-
-
  
2 1/2
.536
13.61
42.7
E
42 3/4
13 3/4
3
2 3/4
2 3/4
-
13.83
43.4
E 1/2
-
-
  
3
.553
14.05
44.0
F
44
14
4
4
3 1/8
-
14.15
44.3
F 1/2
-
-
  
3 1/4
-
14.25
44.6
-
-
-
  
3 3/8
-
14.36
44.9
G
45 1/4
-
5
5 1/4
3 1/2
.569
14.45
45.2
-
-
14 1/2
  
3 5/8
-
14.56
45.6
G 1/2
-
 
6
 
3 3/4
-
14.65
45.9
H
46 1/2
  
6 1/2
4
.585
14.86
46.5
H 1/2
-
15
7
 
4 1/4
-
15.04
47.1
I
47 3/4
  
7 3/4
4 1/2
.601
15.27
47.8
I 1/2
-
15 1/4
8
 
4 5/8
-
15.40
48.1
J
49
15 1/2
 
9
4 3/4
-
15.53
48.4
-
-
   
5
.618
15.70
49.0
J 1/2
-
15 3/4
9
 
5 1/8
-
15.80
49.3
K
50
  
10
5 1/4
-
15.90
49.6
-
-
   
5 3/8
-
16.0
50.0
K 1/2
-
 
10
 
5 1/2
.634
16.10
50.3
L
51 3/4
16
 
11 3/4
5 3/4
-
16.30
50.9
-
-
   
5 7/8
-
16.41
51.3
L 1/2
-
   
6
.650
16.51
51.5
M
52 3/4
16 1/2
12
12 3/4
6 1/4
-
16.71
52.2
M 1/2
-
   
6 1/2
.666
16.92
52.8
N
54
17
13
14
6 3/4
-
17.13
53.4
N 1/2
-
   
7
.683
17.35
54.0
O
55 1/4
17 1/4
14
15 1/4
7 1/4
-
17.45
54.7
O 1/2
-
   
7 1/2
.699
17.75
55.3
P
56 1/2
17 3/4
15
16 1/2
7 3/4
-
17.97
55.9
P 1/2
-
   
8
.716
18.19
56.6
Q
57 3/4
18
16
17 3/4
8 1/4
-
18.35
57.2
Q 1/2
-
   
8 1/2
.732
18.53
57.8
-
-
18 1/2
17
 
8 5/8
-
18.61
58.4
R
59
  
19
8 3/4
-
18.69
58.4
-
-
   
8 7/8
-
18.80
59.0
R 1/2
-
   
9
.748
18.89
59.1
-
-
19
18
 
9 1/8
-
19.10
59.4
S
60 1/4
  
20 1/4
9 1/4
-
19.22
59.7
-
-
   
9 3/8
-
19.31
60.0
S 1/2
-
   
9 1/2
.764
19.41
60.3
-
-
19 1/2
19
 
9 5/8
-
19.51
60.6
T
61 1/2
  
21 1/2
9 3/4
-
19.62
60.9
-
-
   
10
.781
19.84
61.6
T 1/2
-
20
20
 
10 1/4
-
20.02
62.2
U
62 3/4
 
21
22 3/4
10 1/2
.797
20.20
62.8
U 1/2
-
20 1/4
22
 
10 5/8
-
20.32
63.1
V
63
  
23 3/4
10 3/4
-
20.44
63.5
-
-
   
11
.814
20.68
64.1
V 1/2
-
20 3/4
23
 
11 1/8
-
20.76
64.3
W
65
  
25
11 1/4
-
20.85
64.7
-
-
   
11 3/8
-
20.94
65.0
W 1/2
-
   
11 1/2
-
21.08
65.3
-
-
21
24
 
11 5/8
.830
21.18
65.7
X
66 1/4
  
26 1/4
11 3/4
-
21.24
66.0
-
-
   
11 7/8
-
21.30
66.3
X 1/2
-
   
12
.846
21.49
66.6
Y
67 1/2
21 1/4
25
27 1/2
12 1/4
-
21.69
67.2
Y 1/2
-
   
12 1/2
.862
21.89
67.9
Z
68 3/4
21 3/4
26
28 3/4
12 3/4
-
22.10
68.5
Z 1/2
-
   
13
.879
22.33
69.1
-
-
22
27
 





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