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By certification 
Jiangsu Zhenya Special Screw Co.,Ltd is one of the leading China flange nuts manufacturers and suppliers, as a professional company, our productive factory is able to produce CE certification flange nuts at both high quality and low price. Welcome to buy discount and cheap, or wholesale products from us.
Flange nuts are hex nuts with a bottom circular flange that is larger than their top hex section. There are two types commonly available: flange lock nuts, which are prevailing torque type lock nuts, and serrated flange nuts, which are free spinning but have a serrated bearing surface to grip the mating surface
