8-18 x 3/4 Phillips Modified Truss Self Drill 410 SS

8-18 x 3/4 Phillips Modified Truss Self Drill 410 SS . Phillips modified truss head tapping screw , spaced or unified threads, and a #2 or #3 drill point. Designed to drill through steel. AISI 1022 or equivalent steel. Rockwell C50-56. Meets F.I.P.-1000.7 for torsional strength & drill speed. Manufactured to SAE J78 for dimensional specifications.