Self-Drilling Roofing Screws

Corrosion-resistant fasteners for strong and reliable fixing.

In roofing installations, the quality of every fixing point determines the long-term integrity of the entire system. A roofing sheet is only as secure as the screws holding it down – and a single failed fixing can be the starting point for leaks, panel displacement, and structural damage that costs far more to remedy than it would have to prevent. Self-Drilling Roofing Screws from Astal Roofing Industries are manufactured to perform consistently at every fixing point – delivering strong pull-out resistance, a watertight seal at the washer, and lasting corrosion protection across the full service life of the roof.

What Are Self-Drilling Roofing Screws?

Self-Drilling Roofing Screws – also known as Tek screws or self-tapping roofing fasteners – are specially designed fixing screws with a drill-point tip that cuts through the roofing sheet and into the structural purlin or sub-frame in a single operation, without the need for pre-drilling. This eliminates an entire step in the installation process, speeds up fixing rates significantly, and reduces the risk of misaligned pilot holes that can compromise fixing integrity.

Each screw is fitted with a bonded EPDM rubber washer beneath a steel cap – compressing against the roofing sheet surface to create a watertight seal at every fixing point and preventing water from tracking down the fastener into the building structure below.

Key Features & Technical Specifications

Stainless Steel &
Carbon Steel Options

Available in both stainless steel – for maximum corrosion resistance in coastal, humid, and chemically aggressive environments – and carbon steel with protective coatings, for cost-effective performance in standard industrial and commercial roofing applications across India.

Anti-Corrosion Coating

Carbon steel variants are treated with a high-performance anti-corrosion coating – providing reliable protection against rust and surface degradation at fixing points, which are among the most corrosion-vulnerable locations on any metal roof due to direct water contact and galvanic exposure.

Strong Grip with EPDM Washers

Each screw is supplied with a bonded steel and EPDM rubber washer assembly that compresses uniformly against the roofing sheet on installation – providing a secure mechanical grip on the panel and creating a watertight seal that prevents water ingress at every fixing point, even under sustained rainfall and wind pressure.

Leak-Proof Fixing

The self-drilling tip and EPDM washer work together to create a fixing point that is both structurally secure and completely weatherproof – eliminating the gaps, misalignments, and washer failures that cause screw fixings to leak over time in lesser-quality fastener systems.

High Pull-Out & Shear Resistance

Engineered to resist the wind uplift forces, thermal movement stresses, and dynamic loads that act on roofing sheet fixings across India’s varied climate conditions – from high-wind coastal regions to heavy monsoon rainfall zones – maintaining fixing integrity across the full design life of the structure.

Available in Multiple
Lengths & Thread Types

Supplied in a range of screw lengths, thread pitches, and head configurations to suit different sheet thicknesses, purlin gauges, and structural substrate types – ensuring the correct fastener is specified for every fixing condition in the roofing or cladding assembly.

Applications

Roofing Sheets

Primary fixing of corrugated, trapezoidal, and standing seam-adjacent roofing profiles to steel or timber purlins across industrial and commercial builds.

Cladding Panels

Secure fixing of wall cladding sheets to girts and structural frames – maintaining panel alignment and weatherproofing integrity across large façade areas.

Structural Assemblies

Used in secondary structural connections – fixing purlins to rafters, girts to columns, and cladding rails to primary frames in pre-engineered and modular building systems.

Stainless Steel vs Carbon Steel - Which Should You Specify?

The choice between stainless steel and carbon steel self-drilling screws depends on the project environment and roofing material:

Stainless Steel Screws

Stainless Steel Screws are recommended for coastal locations, high-humidity industrial environments, and projects using PPGL or galvalume roofing sheets – where galvanic compatibility and maximum corrosion resistance are required for the full design life of the structure.

Carbon Steel Screws with Anti-Corrosion Coating

Carbon Steel Screws with Anti-Corrosion Coating are a cost-effective specification for standard industrial and commercial roofing projects in non-aggressive environments – delivering reliable performance and corrosion protection at a more economical price point for large-volume procurement.

Our technical team can assist with fastener specification based on your roofing material, purlin gauge, environmental exposure category, and project budget – ensuring the right screw is selected before procurement, not discovered after installation.

Why Source Roofing Screws from Astal Roofing?

Sourcing your self-drilling roofing screws from the same supplier as your roofing sheets removes a procurement variable and a compatibility risk in one step. At Astal Roofing Industries, our fasteners are selected and stocked to complement our full range of roofing sheets – so screw length, thread pitch, and washer size are matched to the sheet profiles we supply, not sourced generically and hoped to fit.

We supply roofing screws in bulk quantities to EPC contractors, roofing sub-contractors, and project procurement teams across India – with consistent product quality, competitive pricing, and the ability to coordinate screw supply alongside sheet delivery for simplified project logistics.