This M12 threshing bolt secures the threshing mechanism components to the rotor or concave assembly in a combine harvester. It is a high-hardness fastener rated to class 10.9, which resists deformation under the cyclic loads and vibration present during threshing. A bolt that stretches or loosens can allow clearance changes between the rotor and concave, reducing separation efficiency and increasing grain loss. The manufacturer machines this bolt to the same shank and thread geometry as the original fastener, so it seats fully in the tapped hole without requiring shimming or thread-locking compounds beyond standard practice. On installation, tighten the bolt to the torque specification for a dry M12 class 10.9 fastener.