This hex-socket bolt secures the header tilt cylinder to the frame of the parent combine harvester. It passes through the cylinder clevis and into the threaded boss on the header mounting bracket, transmitting the full actuation force from the cylinder to the header assembly. A loose or fatigued bolt allows the cylinder to shift, causing uneven header height response and accelerated wear at the pivot points. This original part is machined to the same shank diameter and thread pitch as the factory bolt, so it seats fully in the tapped bore without requiring a thread chaser or oversize tap. On reinstallation, clean the threads and apply thread-locking compound to the specified torque.