Description

Hot dip galvanized fasteners are dipped in the molten protective coating and you're not to use a zinc or a stainless-steel nut on a hot dip galvanized bolt. Hex jam nuts are thinner than a standard hex nut but have the same dimension across the flats and corners. ... A jam nut can be threaded onto a bolt and run tight against the standard nut which will lock the nut in place and prevent it from backing off. Jam nuts are sometimes used for leveling purposes as well.