5/16 inch
The head size is 1/2 inch for the 5/16 inch lag bolts. We offer both plain and black oxide finishes. Be sure to call if you need a size we are not offering.
31lag

Hex lag bolts, often called a lag screw, are for fastening in wood.  Blacksmiths commonly use them to attach their ironwork in homes and on buildings or structures during installation.

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Square Head Lag, 5/16 inch - Black Oxide Finish
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Square Head Lag with Black Oxide Finish

Item #: SH0312LB01000, SH0312LB01250, SH0312LB01500, SH0312LB01750, SH0312LB03500, SH0312LB05000

Square Head Lag, 5/16 inch - Plain Finish
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Square head lag bolt with plain finish.

Item #: SH0312LP01750, SH0312LP02000