US Bolt Head/Wrench Size

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Bolt Diameter Head and Wrench Size
Hex Bolt
-
Lag Bolt
-
Square Bolt		 Heavy Hex Bolt
#6 1/4" -
#8 1/4" -
#10 5/16" -
#12 5/16" -
1/4" 7/16" or 3/8" -
5/16" 1/2" -
3/8" 9/16" -
7/16" 5/8" -
1/2" 3/4" 7/8"
9/16" 13/16" -
5/8" 15/16" 1-1/16"
3/4" 1-1/8" 1-1/4"
7/8" 1-5/16" 1-7/16"
1" 1-1/2" 1-5/8"
1-1/8" 1-11/16" 1-3/4"
1-1/4" 1-7/8" 2"
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