Torsion shear bolt is a special high‑strength structural bolt with a splined plum‑shaped tail. When tightened by special electric torque wrench, the spline tail will shear off once the preset pre‑tension is reached, which provides visual confirmation of proper tightening. It is supplied as a complete assembly including bolt, nut and washer. Material: alloy steel, performance grade 10.9S. Finishes: black phosphating, hot‑dip galvanized. Widely used for steel building frames, bridges, industrial plants, transmission towers and heavy‑duty steel structure connections.