D-Fixings are fire-rated, with close threads for high performance. D-Fixings are ideal for securing D-Line Safe-D ranges, and other electrical installation equipment. D-Fixings can be used in masonry, plasterboard / breeze-block, concrete, brickwork and wood. * Satisfies BS7671 & BS5839-1 requirements * 40mm L x 5.1mm Thread width, 8.3mm Head width * Non-corrosive finish * No need for plastic wall plugs * Excellent tensile strength, shear strength and pull-out load performance * Self drilling screws * 40mm long shaft and close threads combine to provide exceptional performance Working with the Safe-D range cable fasteners from D-Line? Make sure you use these D-Fixing screws for a solid and secure fire-rated fix. D-Fixings can be used in plasterboard, wood and masonry - stone, brickwork, breeze blocks or concrete aren't a problem for these 40mm countersunk screws. Designed with close threads for exceptional performance, there's no need for anchors or plastic wall plugs. * Fire-rated screws for use with electrical installations * Perfect for securing the Safe-D range from D-Line * 40mm countersunk screws with 8.3mm head * 5.1mm thread width for exceptional performance * No need for anchors or plastic wall plugs * Fits 4mm pilot hole in brick - may vary for different substrates * Shallow head optimises space remaining for cables * Excellent tensile strength, shear strength and pull-out load performance * Certified to hold Safe-D clips and cable loads up to 970degC for 2 hours * Satisfies BS7671 and BS5839-1 requirements