Also named torshear type high strength bolt. Equipped with a splined tail at the bolt end. When installing with special electric wrench, the spline will be sheared off automatically once reaching the designed pre-tension force. Stable clamping force, easy construction, reliable connection quality. Supplied as complete sets including bolt, hex nut and flat washer. Made of alloy steel, widely used in steel structure buildings, bridges, workshops and large engineering projects.