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

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Name: Hex Washer Head Self-Drilling Roofing Screw with EPDM Washer
, Material: Made from Hardened High-Grade Carbon Steel
, Standards: Complies with DIN 7504, ISO 15480, and GB/T 15856.2
, Grade: Available in Grades 8.8 and 10.9
, Specifications: Diameter options include M4.2, M4.8, M5.5, and M6.3 (Imperial sizes #8, #10, #12, #14); Length ranges from 13mm to 200mm
, Surface Treatment: Features environmentally friendly high-gloss yellow zinc plating
, Design Features: Includes a hardened milled drill tip, an integrated EPDM rubber sealing gasket, and a hexagonal flange with a large head design. Notable for its custom markings, special thread pitch, and high-strength threads.
, Applications: Ideal for light steel structures, corrugated steel roofing and walls, outdoor billboards and large signs, ventilation ducts, HVAC engineering, timber roof trusses, outdoor facilities, automotive modifications, and vehicle manufacturing.
, Delivery Time: Ships within 15-30 days after receiving advance payment
, Origin: China
, Brand: JGD
, Minimum Order Quantity: 10,000 pieces, negotiable
, Samples: Available upon request
, Packaging: Options include boxed, bulk, pallet, or customized solutions
, OEM Services: Available for tailored products

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As a leading supplier and factory in China, we provide high-quality Hex Washer Head Self-Drilling Roofing Screws designed to meet various industrial needs. Contact us for more information and to place your order!

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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.
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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

    • 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

    Core Product Features

    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 needed. One person can complete drilling, tapping, and fastening in one step, significantly reducing labor costs.

    EPDM Sealing Washer

    EPDM Sealing Washer – Leak-Proof

    Integrated EPDM rubber washer forms a 360° elastic seal that effectively blocks rain and moisture. It maintains elasticity from -40°C to 120°C, ensuring a service life of decades for steel roofing and outdoor applications.

    Hex Flange Head

    Hex Flange Head + Anti-Slip Teeth

    Fits power wrenches for high torque; bottom anti-slip teeth bite into the substrate, providing mechanical locking against vibration and thermal expansion. Grade 8.8/10.9 hardened carbon steel offers high tensile strength.

    Factory Environment

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    High-Quality Screw Display

    Frequently Asked Questions

    Q: Do these self-tapping screws require pre-drilling?
    A: 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.
    Q: What makes the EPDM washers better than standard rubber?
    A: EPDM washers offer superior resistance to aging, UV rays, and ozone. They maintain a 360° elastic seal in temperatures ranging from -40°C to 120°C, preventing leaks for decades.
    Q: Can I customize the head shape or surface treatment color?
    A: Yes. We offer flexible customization for head/slot shapes, special materials, extra-long specifications, and various surface treatment colors to meet your specific project requirements.
    Q: How do you ensure the quality and traceability of the materials?
    A: We implement a full traceability system based on furnace number batches, source locking for raw materials, and provide third-party material certifications for all products.
    Q: Do you provide samples for testing before a bulk order?
    A: Absolutely. We offer free sample making and testing services, along with technical support such as selection calculations and BOM optimization.