AP headmarked TEK screws

Self-Drilling Tek® Screws

Self-drilling screws, or Tek® screws, see frequent use in commercial heating and air conditioning installations. These fasteners feature drill-style tips, allowing users to skip the pre-drilling process and safely secure materials, particularly sheet metal. Tek® screws are valuable in numerous applications, with metal roofing projects being one of the most common.

At All Points Fasteners, we have an extensive selection of nails, screws and other fasteners for all kinds of construction jobs. We offer self-drilling Tek® screws in carbon steel and also two types of stainless steel, 410 and 18-8, with the option to have painted heads to complement various surfaces, and different shank sizes are available to complete any metal-on-metal project you are working on. Let us help you get the job done efficiently with our timesaving tools.

Different Sizes of Tek® Screws

Each project needs specific fasteners to accomplish a given goal. On a screw, the shank is the long, threaded part that connects the tip and the head. You generally need the shank to be a particular size to suit the metal you’re working with. Think of these threaded rods like clothes — the bigger the shank, the larger the size. As such, a number 10 screw will be larger than a number 8.

The type of head style you need can also vary based on the job. The most popular head style features six flat sides and is known as a hex head screw. These fasteners are commonly used in the HVAC industry, especially the 10×3/4 hex washer head.  Measuring across the head of these self-drilling screws will help you determine the shank number. The three most common head sizes and their corresponding shanks are:

  • 1/4 hex drive: Size 6 or 8 shanks.
  • 5/16 hex drive: Shank sizes 10 and 12.
  • 3/8 hex drive: Size 14 screw shank.

The most common screw used by heating and air companies is the 5/16, as a size 10 shank works well for attaching sheets of metal. All Points Fasteners offers all of these sizes and numerous others for purchase.

Understanding Which Type of Screws You Need

If you’re a contractor, it’s necessary to be as specific as possible when asking for any type of fastener. Tek® screws are indeed self-tapping screws — screws that cut their own threads — but it isn’t because of their tip. The tip is self-drilling while the threads are self-tapping.  When asking for a tek screw, many people ask for a self tapper which could end up getting you the wrong screw since sheet metal screws and zip screws as also self-tapping.  Just make sure you describe the tip of the point, and you should be good.  We like to describe it as a drill bit type tip or one that resembles a shovel.   There is one main difference between these types of screws:

  • Self-tapping screws: The threads allow the screw to tap it’s own threads into the material.
  • Non-self-tapping screws: Machine screws are one type of this type of screw.  They require a pre-threaded nut or other female insert.

Knowing the difference between various types of fasteners saves you time and lets you get back to the job site with the necessary tools in hand.

Buy Self-Drilling Tek® Screws From All Points Fasteners

We know how important it is to get your construction job done right the first time — our high-quality fasteners and knowledgeable team can help. Request a free quote on the construction tools you need for your next project!

Head Screw Lady Since 1986! Specializing in breaking down the language barrier between suppliers and end users. During her 35 years working in the fastener industry, MaryLouise has worked directly with end users, contractor’s, OEM’S and DIY, as well working within the import industry, working with fastener manufacturers and distributors. This has given her the unique perspective of having the technical knowledge needed to perform in the fastener world but also be familiar with the needs of end users who don’t necessarily know the fastener jargon or applications to know exactly what they need for their jobs.