Structural Bolts w/ Nuts

Structural Bolts, also known as heavy hex head bolts, are mainly used in steel-to-steel applications where there is a high load application with a high tensile strength.  Structural bolts are mainly used in steel building frameworks and bridges.  ASTM A325 and ASTM 490 are specifically given to structural bolts.  The ASTM F3125 specification includes ASTM A325, A325M, A490, A490M, F1852, and F2280.  Consult with the engineer if you are unsure of the specific grade to be used in the application.