GRADE 8 PLOW BOLTS: Plow bolts have a slightly beveled head with a square neck under the head. The square neck sits in a prefabricated square hole in the steel. This keeps the bolt from turning as a nut is tightened on to the bolt. A Grade 8 bolt has a greater tensile strength than Grade 5 and Grade 2 bolts. They are designed for use in high stress applications. The length of a Plow bolt is determined by measuring from under the head of the bolt to the base of the threads. Please note you are buying by the pound so confirm your pieces when considering how much to purchase. (##) Number of pieces in 1 pound.