Techfast TFHH5551 Roofing Screw - Heavy Section Purlins 5.5 X 51Mm (Bag Of 100)

Roofing Screws. Steel To Steel (For Heavy Section Purlins). Washered Self-Driller. Steel Sheet To Steel Purlin. Head: Hexagon Self-Drilling. Finish: 'Elementech' Coating For Superior Anti-Corrosion - Salt Spray Tested To 1000 Hours. Techfast Screws For Heavy Section Purlins Will Fix Material To Purlins Between 6.0Mm To 12.5Mm. The 16Mm Rubber Washer Beneath The Aluminium Flange Expands Under Pressure And Forms A Permanent Weather-Seal. Designed For Fixing Cladding And Sheet Metal To Light And Heavy Structural Purlins As Used When Constructing Industrial Units.PTDFORDIRTFHH5551