Shear bolts serve two purposes. One is to fasten the auger to the auger gearbox shafts. The other purpose is to prevent damage to the auger and/or gearbox in the event the auger contacts a solid object during snow removal. These shear bolts are classified as a grade 2 bolt, which are hard enough to maintain auger rotation, yet soft enough to shear if the auger is prevented from rotating. These bolts are available through our Authorized Service Centers.