Tek screw bonded washers consist of a metal backing permanently bonded to an EPDM rubber seal.
When a Tek screw is tightened, the rubber compresses to create a watertight and airtight barrier, while the metal ring distributes the load to prevent the cladding from distorting.
Key Specifications
The most common diameters for roofing and cladding are 16mm and 19mm.
Typically sized to fit standard 5.5mm or 6.3mm Tek screw threads.
Backing Materials:
Galvanised Steel: Standard for general-purpose outdoor use and matching steel purlins.
Stainless Steel (A2/304 or A4/316): Essential for high-corrosion environments like coastal areas or chemical plants.
Aluminium: Frequently used with aluminium roofing sheets to prevent galvanic corrosion.
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