Hex head cap screws feature a thick, hexagonal head with a washer face under the head to provide an ample bearing surface for tightening with a wrench. They are general-purpose threaded fasteners designed for insertion in pretapped holes or for use with nuts.	HEAD TYPES In addition to the standard hexagonal head type, hex head cap screws are available in these configurations:	Self-Sealing Hex Features a vibration-resistant silicone O-ring under the head to seal out air, water, lubricants, and liquid and gas contaminants.
	12-Point with Flange Features a 12-point external head design that allows higher torques without rounding the head during tightening. Flange acts like a washer.	Serrated Flange Hex Has serrations under the flange that bite securely into materials to prevent loosening. Flange acts like a washer.