The hex head cap screw is a common fastener in construction and machine assembly. The screw head is designed to fit ratchet or spanner torque wrenches for tightening to exact specifications. As an alternative to welds or rivets, cap screw fasteners offer easy disassembly for repairs and maintenance. Grade 8/Property Class 10.9 screws provide high tensile strength. This listing is for pkg. of 5. Technical Specification Item Hex Head Cap Screw System of Measurement Metric Cap Screw Type Hex Head Cap Screw Basic Material Steel Material Grade Class 10.9 Fastener Finish Blue Phosphate Dia./Thread Size M20-2.5 Fastener Length 100mm Fastener Thread Direction Right Hand Fastener Thread Type Metric Coarse Fastener Thread Style Partially Threaded Fastener Industry Standards DIN 931 Head Type Hex Min. Thread Length 46mm Head Height 13mm Head Width 30mm Proof Load 120, 350 psi Tensile Strength 150, 800 psi Rockwell Hardness C33