Premium ST2.9-ST6.3 Self-drilling Screws: The Efficient Fastening Solution
Our ST2.9-ST6.3 Self-drilling Screws, widely known as Tek Screws, are engineered to streamline your assembly process by combining drilling, tapping, and fastening into a single step. Manufactured strictly to DIN 7504 standards, these fasteners feature a flute-like drill point that functions just like a drill bit. Whether you are installing metal roofing or constructing heavy-duty steel frames, our self-drilling fasteners provide the speed and strength required for modern industrial applications.
As a leading self-drilling screw factory, we utilize C1022 case-hardened steel and 410 stainless steel to ensure our screws can penetrate tough metal surfaces without pre-drilling, saving significant labor time and reducing tool wear.
- One-Step Installation: No pre-drilling required, significantly increasing productivity on the job site.
- Precision Drill Points: Available in #3 and #5 points, capable of drilling through steel plates up to 12mm thick.
- High-Grade Materials: 410 Stainless Steel options are heat-treated for hardness while maintaining excellent corrosion resistance.
- Advanced Coatings: We offer Ruspert and Dacromet finishes for 1000+ hours of salt spray protection, ideal for coastal or industrial environments.
Select the correct metric self-drilling screw based on your material thickness and head style requirements.
| Thread Size | Thread Dia (mm) | Max Drill Capacity | Recommended RPM |
|---|---|---|---|
| ST3.5 | 3.5 mm | 2.2 mm | 2200 – 2500 |
| ST4.2 | 4.2 mm | 3.0 mm | 1800 – 2200 |
| ST4.8 | 4.8 mm | 4.5 mm | 1500 – 1800 |
| ST5.5 | 5.5 mm | 5.5 mm | 1200 – 1500 |
| ST6.3 | 6.3 mm | 6.5 – 12 mm | 1000 – 1200 |
Our ST-Series Tek Screws are essential components for various high-demand sectors:
- Metal Building & Roofing: Securing corrugated metal panels to steel purlins using Hex Washer Head screws with EPDM washers.
- Solar Panel Installation: Using SS410 self-drilling screws for mounting brackets to aluminum or steel structures.
- HVAC Ductwork: Fastening galvanized ducts where quick, secure joints are necessary.
- Steel Framing: Heavy-duty #5 point screws for joining thick structural steel members.
Q: Can I use 304 Stainless Steel self-drilling screws for steel plates?
A: Standard 304/316 Stainless Steel is too soft to drill through steel. We recommend our Bi-metal screws (304 body with a carbon steel drill tip) or 410 Stainless Steel for drilling applications.
Q: What is the benefit of an EPDM washer?
A: EPDM washers provide a UV-resistant, waterproof seal, making them perfect for roofing screws to prevent leaks at the fastening point.
Source ST2.9-ST6.3 Self-drilling Screws from a Trusted Factory
Seeking bulk self-drilling screws with mill test reports and competitive wholesale pricing? We support OEM customization and global shipping. Contact us today for a free quote and technical samples!
