Half-thread bolt is hex head bolt with smooth unthreaded shank under the head and threaded section only at the end. The smooth shank offers good shear resistance. Common strength classes: 8.8,10.9,12.9. Material: carbon steel / alloy steel; finishes: blue-white zinc plated, color zinc plated, Dacromet, black oxide. Widely used for steel structure, machinery, bridge and equipment assembly.