Forgefix TechFast Roofing Sheets to Steel Hex Screws are used for joining metal roofing panels to steel frame buildings. The screws are fire resistant and corrosion resistant. Protected by Elementech corrosion resistant coating, salt spray tested to 1000 hours. Complies with EU Safety, Health and Environmental requirements. They are supplied with 16mm EPDM rubber washers.These Forgefix TechFast Roofing Sheets to Steel Hex Screws have the following specification: Size: 5.5 x 40mmEffective Thread Length: 17mmPack Size: 100Drill Tip: No.5 No.5 drill tip for self-drilling in heavy gauge steel up to 12.5mm. Securely fasten roofing sheets to steel with these high-quality ForgeFix TechFast screws. Designed for heavy-duty applications, these self-drilling screws offer a robust and reliable solution for your roofing projects. Features Self-drilling No.5 drill tip for efficient installation. Suitable for heavy gauge steel up to 12.5mm thickness. Includes integrated washer for enhanced sealing and durability. Hex head for secure tightening with a suitable driver. Supplied in a convenient box of 100. Specifications Brand: ForgeFix MPN: TFHW16SD5540H EAN: 5028485195719 Size: 5.5 x 40mm Effective Thread Length: 17mm Pack Size: 100 Drill Tip: No.5