Welcome to HomeDIYer's premium Tek screws collection – your solution for fastening metal, wood, and steel. Our self-drilling and self-tapping screws eliminate the need for pre-drilling, saving you time on construction projects. Featuring corrosion-resistant stainless steel variants in sizes #8-#12 with TEK 3, TEK 5, and TEK 8 drill points, these screws penetrate materials up to 1/2 inch thick. Whether attaching metal roofing, securing wood-to-steel joints, or working with thick steel, our engineered threads provide superior grip strength. Bulk packaging options available for contractors, with compatibility for standard drill drivers. Discover why professionals choose our zinc-plated and galvanized screws for outdoor durability.
Tek screws (technically known as self-drilling fasteners) feature integrated drill points that create pilot holes while driving. Unlike traditional screws, they combine drilling and fastening in one step - ideal for metal-to-metal or wood-to-metal applications. The "TEK" designation (TEK 3, TEK 5, etc.) indicates drill point length and material thickness capacity.
TEK 3 = drill point for up to 0.025" material thickness (22–20 gauge). TEK 5 = up to 0.125" (1/8") steel. TEK 8 = up to 0.25" (1/4") steel. Always match the TEK number to your thickest material layer.
For standing seam metal roofs, use TEK 5 stainless steel screws with neoprene washers. The hex head allows torque control without stripping, and the EPDM gasket prevents water infiltration – 25-year lifespan in coastal zones.
| Size | Shank Diameter | Max Material Thickness | TEK Designation |
|---|---|---|---|
| #8 | 0.16" | 1/4" | TEK 3 |
| #10 | 0.19" | 3/8" | TEK 5 |
| #12 | 0.21" | 1/2" | TEK 8 |
Pro Tip: For 5/16 tek screws (70 searches), pair with 1/4" hex driver.
Optimal screw length = total material stack thickness + 3-4 thread pitches beyond the farthest layer. For example, joining 1/8" steel to 1/2" plywood: total stack ~5/8", add 1/4" for grip = use 7/8" to 1" screw length.
If the screw spins without advancing, increase down pressure. If the drill point smokes, reduce RPM. For stainless steel, use cutting oil or a wax stick to prevent work hardening.
| Material | Recommended Screw Type |
|---|---|
| Thin Steel (22ga) | TEK 3 with pan head |
| Thick Steel (1/4") | TEK 5 self drilling screws |
| Aluminum | Coated #10 tek screws |
| Pressure-Treated Wood | Galvanized tek screws |
Zinc-plated (blue/clear) – interior use only. Yellow zinc dichromate – moderate corrosion resistance. 304 stainless steel – coastal/marine. 410 stainless steel – hardened for heavy structural steel (drills faster than 304).
Yes, but select a low‑thread design with a sharp drill point (TEK 3 or TEK 5). Reduce RPM to 800–1000 to prevent melting the substrate.
Use a screw extractor set or cut a slot with a rotary tool. For hex heads, try a rubber band over the driver bit to fill stripped areas.
HomeDIYer TEK-5 Pro Pack – 500 screws, #2 Phillips drive, zinc-plated, 1-1/4" length. Includes a free #2 impact bit. Rated for 18ga to 3/16" steel. Over 4,200 five‑star reviews.
Shear strength ratings:
All HomeDIYer Tek screws exceed ASTM requirements: #8 = 1,200 lbs, #10 = 1,800 lbs, #12 = 2,500 lbs. Stainless steel variants have 85% of carbon steel values but superior corrosion resistance.
