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Hex Bolt Head Size Chart

Diameter Head Size
1/4" 7/16"
5/16" 1/2"
3/8" 9/16"
7/16" 5/8"
1/2" 3/4"
9/16" 13/16"
5/8" 15/16"
3/4" 1 1/8"
7/8" 1 5/16"
1" 1 1/2"
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