5/8"-11 x 2-1/2", Grade 8
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Hex bolts
Bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Also known as hex cap screws or machine bolts.
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Flange bolts
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.
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Carriage bolts & Plow bolts
Bolts with no drive and machine threads for use with a nut.