5/16"-18 × 1/2" Grade 8 Indented Hex Flange Screw – Zinc Yellow CR+6, Baked (Non‑Serrated)

Engineered for high‑strength structural and automotive applications, the 5/16"-18 × 1/2" coarse‑thread Grade 8 indented hex flange screw is commonly used for frame and chassis assemblies. The integrated non‑serrated flange provides even load distribution while protecting mating surfaces, eliminating the need for a separate washer. Manufactured from hardened alloy steel, this fastener features a zinc yellow CR+6 finish for improved corrosion resistance. A post‑plating bake process helps reduce the risk of hydrogen embrittlement, ensuring reliable performance in high‑stress environments.