General description Forgefix TechFast Composite Panels to Steel Hex Screws are designed for joining composite panels to steel frame buildings. These screws feature a specially designed compression control thread that prevents damage and denting of the panels. They are supplied with 19mm EPDM rubber washers and are fire and corrosion resistant, protected by Elementech corrosion resistant coating, which has been salt spray tested for 1000 hours. Technical specifications Diameter: 5.5mm Length: 185mm Insulation Thickness: 92-150mm Pack Size: 50 Drill Tip: No.5 for self-drilling in heavy gauge steel up to 12.5mm MPN: TFHW19CPSD55185H EAN: 5028485196099 Other information