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10-16 x 3/4 Hex Washer Head Self Drilling Screw Zinc Plated Tek #3 (8000) M20-2.5 Hex Cap Screws 8.8 DIN 933 Zinc Plated (Fully Threaded) 10-24 x 3/8 Phillips Flat10 16 x 3 4 Hex Washer Head Self Drilling Screw Zinc Plated Tek #3 (8000). A tapping screw with an integrally formed hex washer head , 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. Meets ASTM A 510 for carbon steel manufacturing. Zinc plating meets ASTM B 117 for salt spray corrosion. Manufactured to