Measurement Conversion Chart

BS Gauge 1/1000" Duz. MM Inches
2 .257 34 6 1/4 1/4
4 .204   5  
5 .182   4 1/2  
6 .162   4  
7 .144   3 3/4 1/8
8 .125 16 1/2 3 7/64
9 .114   2 3/4  
10 .101 13 2 1/2  
11 .090   2 1/4  
12 .080 10 2 5/64
13 .073 9 1 3/4  
14 .062 8 1 1/2 1/16
15 .056      
16 .051 7 1 1/4  
17 .045 6   3/64
18 .040 5 1  
19 .036 4 1/2    
20 .031 4 3/4 1/31
21 .028 3 1/2    
22 .025 3    
23 .022      
24 .020 2 1/2 1/2  
25 .018      
26 .016 2   1/64
27 .014      
28 .012      
29 .011      
30 .010 1 1/4