Standard USA Hex Socket Outside Diameters

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.)

Craftsman^R 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