Hex head cap screws are common threaded fasteners with hexagonal heads, which are six-sided tops without indentations. These screws allow for greater torque than traditional circular screws and are installed or removed with socket wrenches. They do not require a nut for fastening and come in a variety of materials and finishes, such as black oxide, zinc plated, zinc yellow, armor coated, hot dipped galvanized, and chrome coated. Coated screws have varying degrees of corrosion resistance based on the type of environment in which they are installed. Hex head cap screws are designed to secure objects within or against other objects for a non-loosening hold. These screws may be fully or partially threaded. Fully threaded screws match up with a threaded hole all the way to their heads for gripping and anchoring thin surfaces. Partially threaded screws are tougher and have an unthreaded area under their head to allow for more holding strength when force is applied from the side.
Low Strength Steel Hex Head Cap Screws
Low strength hex cap screws are made from standard hardware-grade steel. Low strength screws can be used on metal or wood. They are a low-cost fastener for use in light-duty applications where the screw is not subject to extreme temperatures or stress. They come in a black oxide finish or may be zinc plated or hot-dipped galvanized for corrosion resistance. Black oxide screws are corrosion resistant in dry environments and zinc yellow screws resist corrosion in wet environments. Zinc plating helps provide durability in wet environments. Hot-dipped galvanized steel screws are more corrosion resistant than zinc-plated screws and have a thicker coating than other finishes.