Hex Head Cap Screws are used to secure an object within or against another object. Specific features like tighter tolerances and a chamfered end with a washer face under the head, zinc plated fasteners have good corrosion resistant qualities and are ideal for indoor and industrial applications by contractors, designers, OEMs, automotive repair and maintenance. Grade 5 fasteners are heat treated and are stronger than grade 2 fasteners. Made from medium carbon steel, quenched, and tempered for increased tensile strength; head markings identified with three radial bars.