Zinc‑plated half‑thread bolt is a hex head bolt with partial threads on the shank, leaving a smooth un‑threaded section. The smooth shank provides better shear resistance, while the threaded section is for nut engagement. Zinc plating delivers good corrosion resistance for indoor and outdoor general use. Material: carbon steel, grade 4.8 / 8.8. Finishes: blue‑white zinc plated, color zinc plated. Widely used for steel structure assembly, machinery, building construction and general fastening applications.