Roofing screws for steel-to-steel applications are ideal for fixing cladding and sheet metal to light and heavy structural purlins, commonly used in industrial unit construction. These washered self-drillers feature a hexagon self-drilling head and an 'Elementech' coating for superior anti-corrosion, salt spray tested to 1000 hours. Designed to fix materials to purlins between 6.0mm to 12.5mm, the 16mm rubber washer beneath the aluminium flange expands under pressure, creating a permanent weather-seal.
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