- Left hand thread bolts feature a reverse thread direction compared with standard fasteners, designed for auto, machine, and industrial repair applications where counter-rotation requires opposite threading to resist loosening - Made from Grade 8 alloy steel for high strength and durability in demanding, high-stress applications - Fully threaded design with threads extending up to the head, also known as tap bolts, enabling full engagement through the part and into a nut or tapped hole - Size options available to fit a range of applications; verify the correct size and compatibility for your specific project - Benefits and performance: provides a strong, secure hold under heavy loads, maintains torque in environments where standard right-hand threads may loosen due to rotation, and supports reliable long-term fastening in rugged applications - Use scenarios 1) Automotive repairs that specify left-hand threaded fasteners to prevent loosening in components subject to counter-rotation or specific torque sequences 2) Machinery and industrial equipment assemblies where a fully threaded fastener is required to pass through components and engage a nut or tapped hole for maximum grip 3) Through-bolt applications in industrial repair projects where a tap bolt is needed for continuous threading up to the head to secure long fastenings across multiple parts Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia