US Bolts - Head and Wrench Sizes

Hex Bolt, Lag Bolt, Square Bolt and Heavy Hex Bolt

hex bolt

Head and wrench size US bolts are indicated in the table below:

Bolt Diameter
(in)
Head and Wrench Size (in)
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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