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A washer is a thin plate (typically disk-shaped) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a screw or nut.
We recommend approximately five roofing fasteners per 1 metre sheet. Winds can create considerable forces on both the upper surface and the underside of metal roofs. To ensure roofs are secure, our 12 x 50 Class 4 screws are recommended for fixing pierced metal sheeting to timber or metal battens.Self drilling hex head fasteners with neoprene sealing washers are manufactored from high tensile steel with Colorbond durable coatings.oof Zip 12 gauge x 50mm Class 4 Tek roofing screws for fixing into timber or steel.