Fastener Product Videos
Self-Drilling Screws vs. Self-Tapping Screws
February 14, 2025
Let’s cover the difference between Self-Drilling Screws and Self-Tapping Screws:
A Self-Tapping Screw generally refers to a screw that can tap its own threads.
There are a lot of screws that fit this description, including Self-Drilling Screws, Sheet Metal Screws., Thread Cutting Screws, and various other types.
Here at Fastener SuperStore, what we call a Self-Drilling Screw is typically known as a Tek Screw or a Drill Screw. It has a drill bit point on the end so you don't have to pre-drill your holes. This makes them quick and convenient. There are often used to drill through thicker gauges of metal. They’re most frequently used in construction projects.
This type of screw is also available with a Bonded Neoprene Washer, suitable for roofing or applications that require a seal.
We also carry this type of screw in various grades of Stainless Steel. For this type of part, we recommend 410 Stainless Steel, which is heat-treated and hardened. 18-8 Stainless Steel is a softer material, but sometimes people choose this option for its corrosion resistance.
Sheet Metal Screws are ideal for applications that have pre-drilled holes. At Fastener SuperStore, we call these Self-Tapping Screws. This type of screw is most common in Types A (or coarse), and AB (or fine). Both styles feature a sharp, pointed tip, but they have different thread spacing. Type A is usually used in wood or thin metal, and Type AB is more effective in brittle materials.
Type B Self-Tapping Screws are a bit different. These have a blunt point and are often used in plastics or thin metal.
No matter what type of screw you’re looking for, Fastener SuperStore has what you need!
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Types of Self-Drilling Screws
Self-drilling screws come in a range of styles built for different substrates and fastening needs. The most common types of self-drilling steel screws are ones designed for sheet metal, framing, and light-gauge connections, with point styles rated by TEK number for drilling capacity. You’ll also see versions with sealing washers for roofing and siding. Head and drive styles vary, too, and a hex washer head is popular for quick driving and solid engagement. Coatings and materials matter based on exposure, with plated steel options for general use and stainless choices for corrosion-prone areas. Choosing the right type is mostly about matching the point style to thickness and matching the head style to the surface you’re fastening.
Choosing the Right Self-Drilling Screw for Your Project
Start with the material you’re fastening into, then pick a point style that can drill through it without bogging down. TEK ratings help here: heavier gauge metal calls for a more aggressive drill point, while lighter work can use a shorter point. Also consider head style, drive system, and whether you need a washer for sealing or load distribution. If you’re used to self-tapping screws, the main difference is that a self-drilling screw doesn’t require pilot holes or a pre-drilled hole, which can cut steps out of your workflow. For stainless applications, Fastener SuperStore recommends 410 stainless because it’s hardened to drill more effectively, while 18-8 is better for corrosion resistance but not drilling performance. Match the screw length to your stack-up so threads fully bite and hold.
Benefits of Using Self-Drilling Screws in Construction
On active sites, speed matters, and self-drilling screws earn their spot because they reduce steps without sacrificing holding power. They drill, create threads, and fasten in one motion, which can lower installation time across repetitive connections. That’s why they’re common in the construction industry for metal studs, track, panels, and building envelopes where consistency counts. They also help reduce tool changes since you’re not switching between drill bits and drivers for every fastener. When the point style is matched to the material thickness, you get cleaner holes, better thread engagement, and fewer stripped fasteners. For crews, that means smoother installs, less rework, and more predictable production rates over the day. Plus, they simplify training for new installers and help keep fastening results consistent across different crews and shifts.
Frequently Asked Questions:
What are self-drilling screws (TEK screws)?
Self-drilling screws, often called TEK screws, have a drill-point tip that bores through material as you drive them. That drill point forms its own hole, then the threads engage right away. They’re built to fasten quickly into metal and other substrates without separate drilling steps.
What materials can self-drilling screws be used on?
They’re most common on metal, especially sheet metal and light-gauge framing. With the right point rating, they can handle thicker steel as well. Some styles are also used for attaching metal to wood or for exterior panels when paired with washers and appropriate coatings.
Are self-drilling screws available in bulk or contractor packs?
Yes. If you’re stocking for jobs or crews, Fastener SuperStore carries bulk self-drilling screws and self-drilling screws bulk options in common sizes and head styles. You’ll also see self-drilling screws wholesale options and wholesale self-drilling screws for sale for larger-volume purchasing.
What is the difference between self-drilling and self-tapping screws?
Self-drilling screws include a drill point that makes the hole and then drives, while many self-tapping screws require an existing opening. Some self-tapping fasteners need a pre-drilled hole to start properly, then they cut threads as they advance. Self-drilling combines both steps.
What head styles are available for self-drilling / TEK screws?
You’ll find several head styles depending on the job, including hex heads for quick socket driving, low-profile heads for sheet metal, and washer heads for better load distribution. Selection usually depends on whether you need a flush finish, higher clamp load, or faster driving.