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Hardened Color Zinc Plated Self-Drilling Hex Head Screws with EPDM Washers - China Suppliers & Factory Direct

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Name: Hex Washer Head Self-Drilling Roofing Screw with EPDM Washer
Material: Hardened High-Grade Carbon Steel
Standard: DIN 7504 / ISO 15480 / GB/T 15856.2
Grade: 8.8 / 10.9
Specifications: Diameter: M4.2, M4.8, M5.5, M6.3 (Imperial: #8, #10, #12, #14), Length: 13mm - 200mm
Surface Treatment: High-gloss environmentally friendly yellow zinc plating
Design Features: Hardened milled drill tip, EPDM integrated rubber sealing gasket, hexagonal flange with large head design, easily identifiable with custom markings, special thread pitch, and high-strength threads
Applications: Ideal for light steel structures, corrugated steel roofing and walls, outdoor billboards, large signs, ventilation ducts, HVAC engineering, timber roof trusses, outdoor facilities, automotive modifications, and vehicle manufacturing.
Delivery Time: 15-30 days after receiving advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable
Samples: Available upon request
Packaging: Boxed, Bulk, Pallet, or customized packaging options
OEM Services: Available
As a leading supplier and factory in China, we are committed to providing high-quality hex washer head self-drilling roofing screws that meet various construction needs. Contact us today to discuss your requirements and optimize your projects with our reliable products.

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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01

    Key Features

    Our self-tapping screws are crafted from food-grade 304 stainless steel and treated to achieve metric Grade 12.9 ultra-high strength, overcoming the traditional hardness limitations of standard stainless steel. Featuring a countersunk Phillips head design, these screws can be installed flush with the workpiece surface for a zero-profile finish, making them ideal for precision electronics and architectural decoration. We have optimized the thread geometry for different substrates (metal, wood) to ensure low-torque driving with high-torque clamping, effectively preventing stripping. As a superior alternative to standard Tek screws, these fasteners perform exceptionally well in thin sheet metal connections, providing an intelligent fastening solution that balances aesthetics with high load-bearing capacity.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    Precision Manufacturing Process

    From wire rod to finished product, we strictly adhere to multiple international standards including ISO, DIN, ANSI, and GB. Utilizing multi-station cold forging technology, we ensure shank diameter tolerances are controlled within microns. Threads are formed through a precision thread rolling process to enhance fastening force. For non-standard requirements, we employ optical imaging sorters to reject minute defects like head cracks. In post-treatment, we offer a wide range of surface finishing options: from conventional zinc plating and nickel plating to highly corrosion-resistant Hot-Dip Galvanizing (H.D.G.), as well as decorative polishing and black anodizing. We even provide food-grade passivation treatment, ensuring every screw has a prolonged fatigue life in demanding environments.
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    Transparency & Customization

    As a source factory, we are committed to breaking down the information barriers of traditional trade. From mill certificates for raw materials to hardness grades (covering Grade 4.8 to Grade 12.9, as well as A2-70 and A4-80 marine-grade stainless steel), all test data is traceable. We support full-chain customization: dimensionally, we can adjust thread length and head thickness according to drawings; functionally, we can combine processes like sandblasting, electrophoretic coating (e-coating) , or chrome plating. Whether you need British Standard (BS) fasteners or require a special colored anodized finish, we offer small-batch sampling. This ensures that when you purchase fasteners from us, you not only receive high-quality products but also full transparency and control over the entire process, from material selection to packaging.
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    No Pre-Drilling · Rust Resistant · More Secure

    This stainless steel Phillips countersunk self-tapping screw, with its rust-resistant and corrosion-resistant material, one-step self-tapping design, and aesthetically pleasing countersunk head structure, has become the preferred solution for metal substrate fastening scenarios that is efficient, reliable, and aesthetically pleasing.
    Product Details

    Manufacturing Process

    ⚙️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

    🛡️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

    🎨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

    👨‍🔧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
    Hardened Drill Tip

    🚀 Hardened Drill Tip – One-Step Penetration

    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.

    EPDM Sealing Washer

    💧 EPDM Pre-Installed Sealing Washer

    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.

    Hex Flange Head

    🔩 Hex Flange Head + Anti-Slip Teeth

    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.

    🏭 Factory Environment

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    🎥 High-Quality Screw Display

    Frequently Asked Questions

    Do these screws require pre-drilling?
    No. Our screws feature a hardened, mill-cut drill tip that allows for one-step penetration through steel sheets and structural steel without the need for pre-drilling or punching.
    What is the advantage of the EPDM washer?
    The pre-installed EPDM washer provides a 360° elastic seal that is leak-proof and resistant to UV, ozone, and extreme temperatures (-40°C to 120°C), ensuring long-term outdoor durability.
    Are these screws resistant to loosening from vibration?
    Yes. The hex flange head design combined with bottom anti-slip teeth creates a mechanical lock that resists loosening caused by wind pressure, thermal expansion, or structural vibration.
    Can I order screws with custom specifications?
    Absolutely. We offer flexible customization for head shapes, slot types, special materials, extra-long specifications, and specific surface treatment colors.
    How do you ensure the quality of the raw materials?
    We utilize a source locking system for raw materials and maintain full traceability through furnace number batching, backed by third-party material certifications.
    What technical support services do you provide?
    We provide on-site failure analysis, BOM optimization, installation tool guidance, free sample testing, and Vendor Managed Inventory (VMI) services.