Hex Cap Screw Hot Dipped Galvanized Steel Bolts W/Nuts 1/2-13X3 Qty 1000. 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. Hex Head Width Flat to Flat : 3/4" (0.750"). Length Measured Under Head : 3.Quantity of Fasteners In Package1000. Material : Hot-Dipped Galvanized Grade 2 Steel? Tracking is provided on ALL Orders. UPS Next Day Air is available, Please inquire for pricing. For YOU, we constantly strive to find ways to improve our performance.