Our hardened color zinc plated hex head self-drilling screws with EPDM waterproof washers (roofing Tek screws) are made of hardened high-grade carbon steel (Grade 8.8/10.9). The hardened milled drill point penetrates steel structures and corrugated roofing directly – no pre-drilling required, completing drilling and fastening in one operation. The integral EPDM rubber sealing washer compresses under pressure against the hole surface, providing a watertight seal that prevents leaks. The hex flange large head fits power wrenches for quick installation, with anti-slip serrations underneath for vibration resistance. Sizes M4.2-M6.3 (Imperial #8-#14), lengths 13-200mm custom. Ideal for corrugated steel roofing/walls, outdoor signage, HVAC ducts, timber roof trusses, and automotive modifications. Installation: drive directly with an electric drill or impact wrench – the drill point creates the hole while the EPDM washer seals.
Hardened Color Zinc Plated Hex Head Self-Drilling Screws with EPDM Waterproof Washers Heavy Duty Tek Drill Tail Fasteners
Manufacturing Process
• Multi Station Cold Heading Technology
• Intelligent Heat Treatment System
• Micron-Level Thread Rolling Process
• Fully Automatic Optical Sorting
• Environmentally Friendly Surface Treatment Line
• Metallographic And Mechanical Joint Laboratory
Quality Control System
• Raw Material Source Locking
• Furnace Number Batch Full Traceability
• Third Party Material Certification
• Process Parameters Open And Transparent
• Salt Spray Test Real Time Monitoring
• International Standard Compliance Declaration
Flexible Customization Capability
• Customizable head/slot Shapes
• Extreme Application Of Special Materials
• Breakthroughs In Extra Large/Long Specifications
• Integrated Assembly Of Components
• Customizable Surface Treatment Colors
• Personalized Packaging And Labeling
Technical Service
• On-Site Failure Analysis
• Selection Calculation And BOM Optimization
• Installation Tool Selection Guidance
• Inventory Management (VMI) Trusteeship
• Free Sample Making And Testing
• International Standard Translation And Interpretation
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Hardened Drill Tip – One-Step Penetration, No Pre-Drilling
The drill tip is hardened and mill-cut, enabling direct penetration through steel sheets, light-gauge steel studs, and structural steel – no pre-drilling or punching needed. An electric drill or impact wrench completes drilling, tapping, and fastening in one step – several times faster than conventional self-tapping screws. Ideal for large roofs, wall panels, and ductwork, significantly shortening construction time and reducing labor costs – one person can work efficiently.
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EPDM Pre-Installed Sealing Washer – Leak-Proof, Never Seeps
The integrated EPDM rubber washer deforms under compression, tightly conforming to the hole wall and panel surface, forming a 360° elastic seal that effectively blocks rain, moisture, and condensation ingress. EPDM resists aging, UV, and ozone, maintaining elasticity from -40°C to 120°C with a service life of decades. Perfect for steel roofing, outdoor signboards, and vehicle bodies – eliminating leakage risks.
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Hex Flange Head + Anti-Slip Teeth – Vibration-Resistant & Stable Under Load
The hex flange head fits power wrenches for high torque and efficiency; bottom anti-slip teeth bite into the substrate during tightening, creating mechanical locking against wind pressure, vibration, and thermal expansion. Grade 8.8/10.9 hardened carbon steel offers high tensile strength for reliable heavy-load structures. Bright zinc plating provides corrosion and wear resistance – long-term outdoor use without rust, extremely low replacement frequency.
Factory Environment
Industrial Capabilities
• Factory Area: 11,405 square meters
• Certifications: ISO, IATF, CE, RoHS, JIS, ASTM
• Manufacturing : 70+ internationally advanced production lines
• Testing: 30+ sets of precision quality testing equipment
• Annual Output: Up to 50,000,000 tons
From Unprocessed Materials to Completed Items
Our factory's fully automated production lines for cold heading, precision thread rolling, controlled-atmosphere heat treatment, and environmentally friendly surface finishing enable closed-loop manufacturing from raw material to finished product. Thanks to inline optical sorting and a digital MES, every fastener meets stringent standards for strength, accuracy, and surface quality. You promise durable, effective, and environmentally responsible fastening.
Innovation Lab:
Expertise and collaboration drive us forward, constantly pursuing innovative solutions. Have a project? Let's get started.
"Pain Point Diagnosis" to "Customized Implementation" in the Whole Joint R&D Process
We provide more than just standard parts. From the beginning, our multicultural engineering team actively contributes to your project. We carefully consider the application context and customize solutions in the lab, seamlessly integrating technology and application, to guarantee that innovative ideas are quickly transformed into practical solutions that reduce overall lifetime costs.
Integrated Verification System: Using "Test Data" to Ensure Innovation
The creative process doesn't stop at the drawing board. Through our internal technical center, we provide one-stop verification for anything from corrosion testing to prototype creation. Through extensive simulated working condition tests, we use empirical data to confirm the performance stability of tailored solutions. This significantly reduces project risks while also attaining truly reliable cost reduction and efficiency improvement.
