Premium ST2.9-ST6.3 Tek Screws: The Ultimate Metal-to-Metal Fastener
Our ST2.9-ST6.3 Tek Screws, officially known as self-drilling screws, are the go-to solution for high-speed metal assembly. Designed with a unique drill-bit shaped point, these Tek fasteners can drill their own pilot hole, tap a mating thread, and fasten securely—all in one motion. This “drill-tap-fasten” capability significantly reduces labor time and tool costs on construction sites and industrial assembly lines.
As a leading Tek screw factory, we strictly follow DIN 7504 quality standards. Our screws are case-hardened to ensure the drill point can penetrate high-tensile steel plates without breaking or blunting, providing a reliable connection for roofing, cladding, and steel framing.
- Enhanced Productivity: Eliminates the need for separate drill bits and pre-drilling operations.
- Heavy-Duty Performance: Our #5 point Tek screws are capable of drilling through structural steel up to 12.5mm (1/2 inch) thick.
- High Corrosion Resistance: Available in Ruspert coating, providing 500 to 2000 hours of salt spray protection for coastal and industrial environments.
- Leak-Proof Sealing: Hex washer head versions can be equipped with EPDM bonded washers, creating a watertight seal for metal roofing applications.
Select the correct metric Tek screw based on your material thickness and drilling capacity requirements.
| Thread Size | Drill Point | Max Drilling (mm) | Application |
|---|---|---|---|
| ST4.2 | #2 Point | 1.5 – 3.0 mm | Light Gauge Steel |
| ST4.8 | #3 Point | 2.0 – 4.5 mm | Standard Roofing |
| ST5.5 | #3 Point | 2.0 – 5.5 mm | HVAC & Steel Frame |
| ST6.3 | #3 / #5 Point | 3.0 – 12.5 mm | Heavy Structural Steel |
Our DIN 7504 Tek Screws are essential for various critical construction sectors:
- Metal Roofing & Cladding: Securing corrugated panels to steel purlins using EPDM washers.
- Steel Structure Construction: Joining hot-rolled steel sections in warehouses and hangers.
- Solar Mounting: Using SS410 Tek screws for mounting rails to metal roofs for weather durability.
- HVAC Installation: Fastening galvanized air ducts and support brackets quickly.
- Tool Selection: Use a high-torque screw gun (approx. 2500 RPM) for standard screws, and lower RPM (approx. 1000-1500) for #5 point heavy-duty screws.
- Apply Pressure: Maintain consistent downward pressure during the drilling phase until the thread engages.
- Avoid Over-Tightening: Stop as soon as the washer compresses slightly. Over-tightening can strip the newly formed threads or damage the washer seal.
Q: What is the difference between a #3 and #5 point Tek screw?
A: A #3 point is designed for standard steel up to 4.5mm thick, while a #5 point has a longer drill flute for structural steel up to 12.5mm thick.
Q: Do you offer Tek screws for aluminum?
A: Yes, we provide Stainless Steel 304/316 Tek screws with hardened drill tips (Bi-metal) specifically for aluminum to avoid galvanic corrosion.
Source Bulk Tek Screws from a Professional Factory
Seeking wholesale Tek screws with mill test certificates and competitive factory pricing? We support OEM customization and global shipping. Contact us today for a free quote and technical samples!
