6-20 x 1 1/2 Phillips Pan Self Drill Screw Zinc Plated . Phillips pan head tapping screw , spaced or unified threads, and a #3 or #4 drill point. Designed to drill through steel to attach wood to metal. AISI 1022 or equivalent steel. Rockwell C50-56. Meets F.I.P.-1000.7 for torsional strength & drill speed. Meets ASTM A 510 for carbon steel manufacturing. Zinc plating meets ASTM B-117 for salt spray corrosion. Manufactured to SAE J78 for dimensional specifications.
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