US Fasteners, External hex, 2-1/2", Grade 8, 11

• 

  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.

• 

  Flange bolts

  Flange bolts have a flange on the bottom of the head that distributes the load like a washer.