A galvanized cap nut is a type of fastener that consists of a hex nut with a domed cap or cover on one end. The cap covers the end of the fastener, protecting the threads from damage and giving it a finished appearance. Galvanized cap nuts have been coated with a layer of zinc to protect them from rust and corrosion. They are often used in outdoor and marine applications where exposure to moisture or saltwater is a concern.
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