Here at BS Fixings, we stock and supply an abundance of fixings and fastenings, including a wide range of screws. With the variety we stock, it can be quite difficult to find the most suitable screw for you and your project. From machine and wood screws to self-tapping and drywall, the choice can sometimes be overwhelming. However, you are in luck! As a company that specialises in fixing and fastening products, we know everything you need to know about them, and have created many blog posts to help you out. In this post, we are going to uncover all the features of self-drilling screws (also known as Tek screws or stitching screws) and how they are used.

What are self-drilling screws?

Similar to a self-tapping screw, a self-drilling screw can fasten materials together without the need for a pre-drilled hole. However, what makes the self-drilling screw different, is that it also features a drill point tip, comparable to a drill bit, which can pierce through thicker and harder materials. When these types of screws are used, they drill their own hole when they are driven into the surface material, creating a strong fastening in one quick motion.

Self-drilling screws are typically used to fasten metal and wood, for roofing, HVAC, and framing, and they can drive through a range of materials, they are suitable for more heavy-duty industrial uses, holding a much stronger bond than regular screws.

What are self-drilling screws made from?

Most self-drilling screws are manufactured out of carbon steel with a zinc plated tip, as it is a tough and robust alloy that can deliver you a long-lasting fastening. For added strength and corrosion resistance, some of these screws are plated in zinc, and can be purchased on our website.

Types of self-drilling screws

Depending on how you are using the screw, you will want to consider the length, diameter, and head of the screw. The head is one of the key features that you will want to take into account, to ensure the fastening remains strong. There are many head types to choose from including bugle head, flat head, and pan head, but on our website we predominantly stock hex head self-drilling screws.

Hexagonal head screws are one of the most utilised types, as they are compatible with a variety of socket drill tools and have both Phillips and slotted drives. The hex head secures onto materials with a considerable amount of hold, as it offers a slightly larger surface area than other head types.

Hex self-drilling screws are also available with an EPDM washer, for purposes where water resistance is required. For example, for roofing joints, the washer enables a foolproof fastening that stops rainwater from seeping into the structure. Due to the flexibility of the rubber, when the screw is drilled in, the washer offers a much tighter seal that protects the surface material.

Installation process

Below we have created some basic instructions on how to use self-drilling screws. As no pilot hole is required, the steps are relatively straightforward and can be completed by beginners and experts alike.

  1. You need to measure the depth/thickness of the material that is being drilled, as the screw will need to be slightly longer to hold it in place.
  2. Self-drilling screws can be used with either a drill or an electrical screwdriver, so you can decide which one you would like to use.
  3. Depending on the screw head and drive, you will need to find a drill bit that matches. You will most likely need a hex socket adapter if you’re using a drill.
  4. Mark the material with a pencil where you want to drill the screw.
  5. Place the screw into the adaptor or electric screwdriver.
  6. Double-check the placement of the pencil mark and position the screw in place.
  7. Drill through the material, making sure to keep a steady grip.
  8. Make sure the fastening is secure, but do not overtighten. If you drill the screw too tightly, the material may deform, and the washer will be less functional.

Please feel free to browse our selection of self-drilling screws on our website today, where you can find products from industry leader, Goebel. If you require more information about the fixing and fastening items that we stock, contact us today on 03330 117818 or email and we will be more than happy to help!