Standard 50mm Self-Drilling Roofing Screw with EPDM Washer

50mm Roofing Screw

The Standard 50mm Roofing Screw provides a high-strength fastening solution for securing corrugated or box-profile metal sheets to timber or light-gauge steel purlins. This fastener features a hardened carbon steel body with a zinc-plated coating to resist atmospheric corrosion. It incorporates a bonded EPDM washer to maintain a watertight seal across the penetration point.

Built for the Job

Roofing contractors and site supervisors specify this fastener for its ability to streamline installation. The integrated drill point cuts through metal cladding and penetrates the underlying structure in one motion, removing the need for labor-intensive pre-drilling. This efficiency is vital for large-scale industrial warehouses and residential roofing projects where thousands of fixings are required. The screw thread is engineered to provide maximum pull-out resistance, ensuring the roof remains secure under high wind loads.

• Fixing metal roof sheets to timber battens or purlins in residential construction.

• Securing side-lap joints on long-run metal cladding to prevent water ingress.

• Attaching metal flashing and ridge caps to the main roof structure.

Product Highlights

Weatherproof Sealing

The bonded Ethylene Propylene Diene Monomer washer remains flexible under extreme temperature fluctuations to prevent leaks.

Self-Drilling Geometry

• Tapered drill point for rapid metal penetration without skating.
• Coarse thread design optimized for high-grip retention in timber substrates.

Technical Specifications

What’s Included

• 1 x 50mm Self-Drilling Roofing Screw (Single Unit)

On-Site & Workshop Notes

• Use a variable speed drill with a hex socket driver bit to avoid stripping the fastener head during high-torque applications.

• Avoid over-compressing the rubber seal; the washer should be tight against the sheet without bulging out past the metal backing.

• When installing into steel thicker than 3mm, ensure the drill point is rated for the specific gauge to prevent tip burnout.

• Store these components in a dry environment to maintain the integrity of the protective zinc coating before use.