Hex Head Cap Screws are a staple in the fastener industry. They are commonly called “hex bolts” but a hex cap screw is made to a higher quality than Hex Head Bolts — allowing the head to hold flush to the clamped material. The hex head cap screw is a common fastener in construction and machine assembly. The screw head is designed to fit a ratchet or spanner torque wrenches allowing you to tighten the screw to your exact specifications. Grade 8 screws provide high tensile strength.