Hillman zinc plated, steel, Hex bolts are machine bolts that have been designed to join materials to prevent shear movement. Zinc grade 2 hex bolts are recommended for most general uses and are corrosion resistant for typical use. The Hex Bolts feature a steel material for added durability. These new Hex Bolts feature a blunt pin type, a grade 2 metal grade and a USS Coarse thread. Be sure to pre-drill any holes and to use washers and nuts of a similar grade and finish.