(4) PA Block bolts. Hold PA Block to Sump Base on E-47, E-57, E-60, E-78, E-58, including H Models. The standard among high-strength fasteners, these screws are stronger than Grade 8 steel screws. They have a minimum tensile strength of 170,000 psi. and a minimum Rockwell hardness of C37. Be sure to use ANTISEIZE when installing these to make future removal easier. Be siure to coat the ENTIRE bolt iwth the Antiseize.