Our stainless steel hex flange self‑drilling screws with EPDM waterproof washers are available in two material options: 410 stainless steel (high hardness HV 400‑500, ideal for heavy‑duty self‑drilling) and 304 stainless steel (A2-70, excellent corrosion resistance). The hex flange large head delivers high torque with power wrenches, while the anti‑slip serrations underneath provide vibration resistance. The hardened self‑drilling point penetrates light‑gauge steel and corrugated sheets directly – no pre‑drilling required – completing drilling, tapping, and fastening in one operation. The integral EPDM rubber sealing washer compresses against the hole surface, delivering IP68 waterproof protection. Sizes M4.2‑M6.3 (#8‑#14), lengths 13‑200mm custom. Ideal for corrugated steel roofing, outdoor fencing, electrical enclosures, signage, and timber‑steel hybrid structures. Installation: drive directly with an electric drill or impact wrench – the drill point creates the hole while the washer seals tightly.
Stainless Steel Hex Flange Self-Drilling Screws with EPDM Waterproof Washer, Drill Tail Self-Tapping 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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Dual Stainless Steel Options – Hardness or Corrosion Resistance as Needed
Available in 410 stainless steel (HV 400-500, high torque and penetration for heavy-duty driving) and 304 stainless steel (A2-70, excellent salt-spray resistance for coastal/outdoor use). Whether prioritizing high-strength penetration or long-term anti-corrosion, there's a solution. With electro-polishing/passivation, the surface stays bright and rust-free – reliable and durable on steel roofing, outdoor fences, and electrical enclosures.
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Self-Drilling Tip + Hex Flange High Torque – Efficient Installation & Anti-Vibration
The hardened self-drilling tip penetrates light-gauge steel, color-coated steel sheets, and aluminum profiles directly – no pre-drilling, with drilling, tapping, and fastening completed in one step by an electric driver. The hex flange head fits power wrenches for high torque without cam-out; bottom anti-slip teeth bite into the substrate, effectively resisting wind pressure, mechanical vibration, and thermal expansion – staying secure without shifting.
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EPDM Pre-Installed Sealing Washer – IP68 Leak-Proof Protection
The integrated EPDM rubber washer deforms under compression, tightly conforming to the hole wall and panel surface to form an elastic seal that completely blocks rain, moisture, and condensation ingress. EPDM resists ozone and UV, maintaining elasticity from -40°C to 120°C without aging or cracking for decades. Perfect for steel roofing, outdoor signboards, and fences – eliminating leakage risks.
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. Because of 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, flawlessly integrating technology and application to guarantee that innovative ideas are quickly transformed into practical solutions that reduce overall lifespan costs.
Integrated Verification System: Using "Test Data" to Ensure Innovation
The creative process doesn't end 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.
