Twist lock Pin used on spreaders, headblocks, And overheight frames. We calculate the stress with Ansys. Die forging rough and NC machining forging ensure processing quality. We machine twistlocks thread with screw rolling machine to enhance the ability of anti-fatigue. A series of high standard tests Including 200% tension test, UT Ultrasonic Testing, Fluorescence magnetic power detection and fatigue Test ensure quality of our products.