This bolt secures the walker finger assemblies to the threshing-unit frame. It passes through the mounting bracket on the walker housing and engages the threaded boss on the finger support bar. The bolt’s head shape and shoulder length match the original fastener profile, so the finger assembly sits at the correct height relative to the concave and the rotor. A loose or missing bolt allows the finger to shift, causing contact with the rotating drum and potential damage to the threshing basket. On reinstallation, clean the threads and apply thread-locking compound to prevent loosening from vibration.