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1999-11-24, Rev. 1999-11-28.

All countries in the world except USA use millimeters (mm).   USA citizens:  To convert mm to inch, divide by 25.400.

Standard USA Hex Socket Outside Diameters  (All dimensions in units of mm unless otherwise specified.)

CraftsmanR USA Socket Outside Diameter 6- point Sockets   12- point Sockets   12- point Sockets  
Nominal Hex Socket Size (inch) 6.35- mm- drive Socket, Head- End Outside Diam- eter Base- End Outside Diam- eter 9.525- mm- drive Socket, Head- End Outside Diam- eter Base- End Outside Diam- eter 12.7- mm- drive Socket, Head- End Outside Diam- eter Base- End Outside Diam- eter
             
0.15625 7.05 11.50        
0.18750 7.95 11.50        
0.21875 9.10 11.50        
0.25000 9.65 11.50        
0.28125 10.60 11.50        
0.31250 11.40 same        
0.34375 12.60 same        
0.37500 13.35 same 14.05 16.67    
0.43750 15.45 same 16.67 same 17.25 22.05
0.50000 17.30 same 17.55 same 19.00 22.05
0.56250     19.20 same 20.75 22.05
0.62500     21.25 same 22.05 same
0.68750     23.10 same 24.00 same
0.75000     25.10 same 26.40 same
0.81250     27.25 same 28.10 same
0.87500         30.00 same
0.93750         31.80 same
1.00000         33.55 same
1.06250            
1.12500            
1.18750            
1.25000            
1.31250            
1.37500            
1.43750            
1.50000