5/16"-18 × 1" Grade 8 Indented Hex Flange Screw – Zinc Yellow CR+6, Baked (Non‑Serrated)

Built for high‑strength structural and automotive applications, the 5/16"-18 × 1" coarse‑thread Grade 8 indented hex flange screw is commonly used in frame and chassis assemblies. The integrated non‑serrated flange spreads clamping force evenly while protecting mating surfaces, eliminating the need for a separate washer. Manufactured from hardened alloy steel, this fastener is finished with zinc yellow CR+6 plating for enhanced corrosion resistance. A post‑plating bake process helps minimize the risk of hydrogen embrittlement, ensuring dependable performance in high‑stress environments.