This is an authentic replacement part manufactured for use with Classen sod cutters, aerators, seeders, and turf brushes. Lock washers are commonly used to prevent bolts from unthreading from the part assembly the bolt is used to secure. The lock washer is sold as an individual replacement part, please see model diagram for part location and usage.
This is an original Classen replacement part, not an aftermarket imitation. The nut is manufactured for use with outdoor power equipment like sod cutters. This nut is a versatile part and can be used on different types of machines, please see model diagram for part uses, location, and application. The nut is sold individually.