Self Tapping / Sheet Metal Screws

Self Tapping Screws

Type A are coarse thread screws commonly used in wood or thin metal; Type AB are fine thread and are more effective in brittle materials. Type B screws have blunt points and are often used in plastics or thin metal. Looking for screws that don't require pre-drilled holes? Try our Self-Drilling (TEK) Screws.

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Types of Metal Self-Tapping Screws

Metal self-tapping screws come in several profiles designed for different materials and holding needs. Type A uses coarse threads and is often chosen when you need an aggressive bite in thin metal or mixed assemblies. Type AB has finer threads that can perform better in brittle substrates where splitting is a risk. Type B typically has a blunt point and is common in light-gauge metal and some plastics. Type U drive is a press-in style used in pre-drilled holes for quick assembly. Across these metal screws, self-tapping types vary by thread form, shank design, and available head styles, including options like a hex washer for higher driving torque and a larger bearing surface. These self-tapping metal screws still rely on a pilot hole, so the screw can form its mating threads during tapping operations without cracking or deforming the material.

Where Are Self-Tapping Screws Used Regularly?

You’ll see self-tapping screws for metal used anywhere pre-drilled holes are already part of the process or where controlled alignment matters. Common examples include HVAC ducting, electrical enclosures, metal studs and track, appliance panels, automotive trim, and light fabrication. They’re also used for brackets, straps, and hangers where the parts are clamped first, then fastened through matched holes. In production settings, metal self-tapping screws help reduce steps because the screw forms threads as it drives, replacing separate drilling and threading. For maintenance teams, they’re handy for repairs when the original fastener is missing, and you need a clean replacement in an existing hole. If you’re stocking hardware for repeat work, bulk self-tapping screws make sense since the same few sizes get used constantly across metal assemblies and field installs.

How to Install Self-Tapping Screws in Metal

For reliable results, start with the correct hole size and alignment. Drill a pilot hole that matches the manufacturer’s recommendation, then keep the screw square to the surface so the threads form evenly. A sharp drill point on the pilot bit helps prevent wandering on smooth sheet metal. Drive at a steady speed and let the screw cut and form its threads through controlled tapping operations, rather than forcing it. If the screw binds, back it out, clear chips, and re-seat to avoid stripping the newly formed threads. Choose the right driver for the head style, and don’t over-torque. If your job needs no pilot hole at all, that’s where TEK screws fit best, since they’re made to combine drilling and fastening in one step. For purchasing, self-tapping screws for sale are often stocked by diameter, length, and head option for easy matching.

Frequently Asked Questions:

What are metal self-tapping screws?

Metal self-tapping screws are fasteners designed to cut or form threads into material as they’re driven into a pre-drilled pilot hole. They’re commonly used in metal assemblies with matched holes, where the screw creates its own thread engagement during installation without separate tapping steps.

What materials are self-tapping metal screws made from?

Most self-tapping screws, metal-based especially, are produced from steel alloys and may be finished for protection. Common options include coated steel for general use and corrosion-resistant variants for damp areas. Selection depends on the environment, required strength, and whether the application is indoor or exposed.

Are self-tapping screws reusable?

Sometimes, but it depends on the hole condition that the screw comes out of and the application when installing the screw initially. If the threads in the material stay intact, the screw can often be removed and reinstalled. In thin metal, repeated removal can wear the formed threads, reducing holding strength over time.

What is the difference between self-tapping and self-drilling screws?

Self-tapping screws for metal require a pre-drilled pilot hole and then form threads as they drive. Self-drilling fasteners, often called TEK screws, include a drill point tip that drills its own hole first, then fastens, eliminating separate drilling for many sheet metal jobs.

What are the advantages of metal self-tapping screws?

Metal self-tapping screws speed up assembly because they create threads during installation, reducing extra tooling and setup. They’re also easy to match to existing holes for repairs and maintenance. With multiple head styles available, they fit everything from panels to brackets cleanly.