This bolt secures the auger paddle to the auger tube on the header of a grain harvester. It fastens the paddle to the tube, transmitting the rotational force that moves crop material toward the feeder house. A loose or missing bolt allows the paddle to shift, reducing auger efficiency and potentially causing damage to the tube or flighting. The bolt is threaded into a welded nut or tapped hole on the auger tube; on reinstallation, apply thread-locking compound and torque to the specification for the assembly.