If you don't want Form C, we also have Form B and Form G washers.
RS Pro Galvanized Form C Washer
The RS Pro Galvanized Form C Washer is designed to distribute the load of threaded fasteners. This washer has a standard thickness and a large diameter.
Features and benefits: Moderate corrosion resistanceSuitable for all types of nuts and boltsSmooth surface suitable for nuts or bolts