If you've ever snapped a screw mid-fix or wasted time drilling endless pilot holes, you know how quickly the wrong fixing can slow down a build.


That’s why we recommend Tek Screws. Primarily used for roofing and cladding, they make it easy to fix metal cladding, fibre cement sheets, and box profiles to steel or timber.


In this guide, we’ll explain how Tek Screws work, explore their main applications, and help you choose the right type for your project.


What are the main uses for Tek Screws?


Tek Screws speed up installation on large builds, making them ideal for projects like:  



  • Roofing and cladding

  • Agricultural sheds and barns

  • Metal fabrication

  • Fencing and other outdoor projects

  • Heating, ventilation and air conditioning (HVAC)

  • Electrical work

  • Solar panel installations

  • Mechanical engineering

  • Structural steel

  • General construction


When you need strength and speed, Tek Screws are a great choice. They drill and fasten in one step, so you don’t need to pre-drill holes or keep switching tools, making installation faster and keeping your project moving.


What makes Tek Screws self-drilling?


Simply put, Tek Screws (also known as self-drilling, cladding, or roofing screws) fix metal to metal or metal to wood. 


They have a sharp drill-point tip that cuts through steel or timber as you drive them in, so there’s no need for pilot holes.


Most standard screws can’t handle tougher materials, but Tek Screws can – without needing tool changes. Different drill points are designed for different materials, helping you achieve the best performance from the fixing.


How Tek Screws work 


All you need is a power drill and a Tek Screw Adapter. The hexagonal head gives you a solid grip, keeping you in control as the drill bit cuts in. Once the tip is through, the thread pulls the materials tightly together.


The screw drills its own hole as it goes in, so installation is much faster than with traditional screws that need pilot holes first. This makes a big difference on roofing or cladding jobs where hundreds, sometimes thousands, of fixings are needed.


If the finish is important, Pancake Head Screws sit flatter against the surface for a neater look. 


Are Tek Screws weatherproof?


Tek Screws usually come galvanised or zinc-coated to prevent rust and extend the life of your structure. 


They stay secure, making them perfect for roofs that need to withstand strong winds or for securing solar panels without vibrations. 


Choosing the right Tek Screw: drill points, threads and materials


Picking the most suitable screw for the job is key. The drill point and thread on a Tek Screw show you exactly what material it’s best suited for. 


Here’s a simple guide:



  • Lighter steel (1.2mm–5mm):  Light-Section Steel Screws have a coarse thread and a Type 3 drill point, so they’re ideal for fixing into light steel sections such as zed purlins.

  • Heavier steel (6mm–12.5mm): Heavy-Section Steel Screws come with a fine thread and a Type 5 drill point, ideal for fixing into heavy steel sections.

  • Fixing sheet to timber: Sheet-to-Timber Tek Screws have a coarse thread and a Type 17 gash point for a strong hold in timber purlins.

  • Cement board: Fibre Cement Screws are made for this material, so you can attach sheets without damaging them.

  • Cladding sheets: Stitcher Screws fasten overlapping cladding sheets together with a coarse thread and a Type 1 reduced-point, making overlaps strong and neat.


With lengths ranging from 16mm to 235mm and diameters between 4.8mm and 7.8mm, you can easily find the perfect fit for your project.


Sealing and protecting your fixings - what do you need?


Once you’ve selected the right Tek Screw, don’t forget to protect it so it lasts.



  • Bonded Washers create a watertight seal for materials like metal roofing sheets and solar panels. Most packs include washers, so you can start straight away. 

  • Butyl Sealant Tape adds an extra layer of protection for joints and overlaps, keeping everything airtight and watertight. 


What about tools and finishing touches?


The right accessories can make installation easier and improve your final result.



  • Tek Adapter: Keeps your drill firmly connected to the screw head to prevent slipping.

  • Colour Caps: Available in all kinds of colours, from subtle shades to bright primaries, they help blend the fixing into your material while protecting the head from the weather.


Choosing the right Tek Screw and taking care with sealing will help your project stay strong and look its best.


Planning your next build? Find the best fixings for the job and shop Tek Screws at Fastco.