Bridge Fasteners has been a leading supplier of Fasteners, nuts, bolts, stainless hardware and contractor products for over 30 years. Quality you can trust! 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. Hex head cap screws are typically used to create a bolted joint, in which a threaded shaft exactly fits a corresponding tapped hole or nut. These Hex Cap Tap Bolts are 18-8 (304) Stainless for corrosion protection and high strength.