5/16-18 x 4 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (300)

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3/8-24 x 4 Grade 8 Hex Cap Screw Plain Domestic USA (250)

1/4-28 x 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (3300)

10-16 x 1 Hex Washer Head Self Drilling Screw Zinc Plated Tek #3 (5000) 5/8-18 Grade 5 Hex Cap Screws Plain - Domestic USA 5/16-18 x 4 1/2 Grade10 16 x 1 Hex Washer Head Self Drilling Screw Zinc Plated Tek #3 (5000). 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 SAE