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The Science of High-Speed Drilling Fasteners
The Self Drilling Screw, also widely known as the Tek Screw, has revolutionized the industrial construction sector by eliminating the need for pre-drilled pilot holes. As a premier Fastener Manufacturer, Youjia Metals produces these high-performance Hex Head Expansion Screws with a focus on drilling efficiency and long-term fastener life. The unique drill point geometry acts as a drill bit, tapping its own threads in a single operation, which significantly reduces labor costs for large-scale Metal to Metal Fastening projects.
Our Hex Washer Head Self Drilling Screws are particularly specialized for heavy-gauge metal substrates. In structural steel framing or metal roofing applications, the ability of the screw to penetrate up to 12.5mm of cold-rolled steel without blunting is critical. We utilize a proprietary heat-treatment process for our C1022A Carbon Steel screws, achieving a surface hardness of 560 HV minimum while maintaining a core toughness that prevents brittle fracture under shearing loads.
To further enhance reliability, these screws are integrated with high-quality EPDM washers. Unlike standard rubber, EPDM (Ethylene Propylene Diene Monomer) is resistant to UV degradation and extreme temperature fluctuations, making our roofing screws the ideal choice for outdoor environments where thermal expansion and contraction are constant challenges.
Weather Sealing
Our integrated EPDM washer ensures a 100% watertight seal, critical for roofing fasteners and outdoor structures.
- UV & Ozone Resistant.
- Temperature range: -40°C to 120°C.
- Prevents electrolytic corrosion.
Drill Capacity
Featuring precision #3 and #5 drill points. Capable of penetrating heavy-gauge steel without pre-drilling.
- High-speed drilling flutes.
- Consistent thread pitch (Class 2A).
- Optimized torque-to-drill ratio.
Custom OEM
As a direct fastener supplier, we offer custom lengths up to 300mm and specialized surface coatings.
- Ruspert & Xylan coatings.
- RAL color matching for heads.
- Full MTR and ISO certs provided.
| Core Keywords | Self Drilling Screw, Tek Screw, Roofing Bolt, EPDM Sealing Screw |
| Available Sizes | M4.2, M4.8, M5.5, M6.3 (Gauge #8 to #14) |
| Material Grade | AISI C1022A Carbon Steel / Stainless Steel 410 |
| Drill Point Type | #2, #3, #4, #5 (Max Drilling Capacity 12.5mm) |
| Standards | DIN 7504, ISO 15480, ANSI/ASME B18.6.4 |
Application Cases
Roofing
Steel sheet roofing and cladding installations.
Steel Frame
Cold-formed steel structural assembly.
Solar PV
Mounting hardware for solar panels on metal roofs.
Automotive
Heavy-duty trailer and truck body building.
Self-Drilling Sourcing FAQ
A: Our #5 Drill Point hex head screws are designed to penetrate cold-rolled steel up to 12.5mm without pre-drilling. For standard roofing sheets, a #3 point is typically sufficient for 4mm to 6mm thickness.
A: We source premium EPDM rubber that passes rigorous compression and UV aging tests. This ensures the seal remains flexible and waterproof even after years of exposure to harsh sunlight and heavy rain.
A: Yes. For marine or coastal projects, we provide specialized multi-layer anti-corrosion coatings like Ruspert (500h-1500h salt spray test) and silver/grey finishes to match your metal sheets.
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