Generic 25mm Hex Head Self-Drilling Roofing Screw with EPDM Washer

25mm Hex Head Roofing Screw

The Generic 25mm Roofing Screw provides a high-strength fastening solution for securing metal roofing sheets to light-gauge steel purlins or timber supports. This fastener features a hardened steel construction with a protective zinc coating to resist atmospheric corrosion. The integrated EPDM washer ensures a watertight seal at the penetration point, preventing moisture ingress in industrial and residential roofing applications.

Built for the Job

This self-drilling fastener, often referred to as a TEK screw, eliminates the requirement for pre-drilling holes in metal sheets up to a specific thickness. The drill point tip cuts through the material while the following threads engage securely to provide high pull-out resistance. Contractors typically use this 25mm variant for valley fastening or when securing thin-profile cladding where longer screws would be redundant or interfere with internal structures.

• Securing corrugated iron or IBR roofing sheets to steel or timber battens.

• Fixing side-wall cladding and flashings in warehouse or shed construction.

• General purpose metal-to-metal fastening in HVAC ducting or fencing projects.

Product Highlights

Self-Drilling TEK Point

The engineered drill flute clears metal shavings efficiently to prevent heat buildup and ensure a clean entry.

EPDM Sealing Washer

• Manufactured from UV-stabilized Ethylene Propylene Diene Monomer for long-term weather resistance.
• Compresses under the hex head to form a permanent waterproof barrier against heavy rain.

Technical Specifications

What’s Included

• 1 x 25mm Hex Head Self-Drilling Roofing Screw with bonded washer

On-Site & Workshop Notes

• Use a standard magnetic nut setter with a cordless impact driver for efficient installation.

• Avoid over-tightening the fastener to prevent deforming the washer, which can compromise the seal.

• Ensure the screw is driven perpendicular to the sheet surface to maintain the integrity of the EPDM gasket.

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