5/8-11 x 16 Hex Bolts Hot Dip Galvanized Cap Screws and Nuts Quantity 25. Hex Cap Screws are bolts with e hexgonal head. Hex cap Sccrews offer a tighter tolerance than its fully threaded tap bolt counterpart and are the most commonly used bolt in the consctruction, automotive, and food industries.A Galvanized coating is the process of applying a protective layer of zinc that prevents rusting. These bolts are coated by the hot dip galvanizing process, in which they are dipped into a bath of molten zinc. These fasteners are a great choice for use with pressure treated wood or any application that is exposed to elements that may cause corrosion. Quantity of Fasteners in Package : 25. Hex Head Width Flat to Flat : 15/16. Threads Per Inch (TPI) : 11. Coarse or Fine Thread : Coarse. Tracking is provided on ALL Orders. UPS Next Day Air is available, Please inquire for pricing. For YOU, we constantly strive to find ways of improving our performance.