US Bolt Head/Wrench Size

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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