The Shear Pin, also known as a shear bolt, is a "fail safe" connector. Commonly found in snow throwers connecting the shaft to the auger or in marine equipment connecting to the propellers, shear pins are designed to protect equipment from sudden impact or excessive load by breaking. In this role, the shear pin protects other, often more expensive or less easily replaced, parts from being damaged. Shear pins are uniquely built for their purposes and should be purchased from an OEM parts dealer, like us.