The Button Head Socket Screw Alloy 12.9 Plain is a Hobson screw designed for demanding fastening applications across industry and construction.Where this product is usedHobson screws cover a broad range of fastening applications from structural framing to precision machine assembly. Steel framing, cladding and roofing installation Mechanical assembly and equipment fabrication General industrial fastening applications Key specifications Grade / Class Class 12.9 Finish Plain Selecting the right optionSelect Hobson screws by application — anchor screws (TX-CON, Xbolt, Jmax) for concrete and masonry, coach screws for timber, button head and socket screws for machine assembly, and SEMS screws for sheet metal. Match drive type, thread form and coating to the substrate and exposure conditions.