Sandwich panel screw (Ruspert coated carbon steel) with 19 mm washer and supporting thread for thick steel base structures (up to 15 mm) A.K.A : Hex Head with EPDM Washer Double Thread Sandwich Panel Screw Self Drilling Roofing Screws Base materials:  Carbon steel Environmental conditions:  Dry indoor, Indoor with temporary condensation, Outdoor with low pollution Product class:  Premium Features - Self-drilling screw for fast assembly in one step - EPDM rubber washer – creates a more reliable seal against water - Fast and robust drill tip with Racing Tip technology – a wave-form cutting edge which removes chips much faster and helps prevents point burn-out - Supporting thread helps to fasten without dents - For reliable fastenings with defined load values Applications - Fastening sandwich panels to steel framing - Duplex-coated carbon steel for fastening in slightly corrosive environments - Thick metal-to-metal connections (up to 15 mm) - Watertight fastenings – 19 mm washer included - Fastening sandwich panels to steel beams Product Name  Hex Head With Washer Double Thread Sandwich Panel Screw Self Drilling Roofing Screws Material carbon steel , C1022 with hardened, or Bi-metal SS304+435 carbon steel Head style Hex flange washer head Washer option  Round cut EPDM Washer, Bonded Washer Finish white/yellow/blue zinc coated, hot-dipped galvanized, zinc-nickel alloy coating, black oxidized, Ruspert(S.S.T 500-1500-hours ) Size 5.3/5.5x80 5.3/5.5x100 5.3/5.5x120 5.3/5.5x130 5.3/5.5x150 5.3/5.5x160 5.3/5.5x180 5.3/5.5x210 5.3/5.5x230 5.3/5.5x280 Drive style Hex Point Cutting Point #2-5 Application/Use Hex Washer Flange Head Self-Drilling  Roofing Screws used to fix metal roof sheeting to Steel roof frame with rubber sealing isolated on  background. Stay tuned  Cheers Website :