US Bolts - Head and Wrench Sizes

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

US Bolts
#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
1 3/8	2 1/16
1 1/2	2 1/4

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US Bolts - Head and Wrench Sizes

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

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US Bolts
Bolt Diameter (in)	Head and Wrench Size (in)
Bolt Diameter (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
1 3/8	2 1/16
1 1/2	2 1/4