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Stainless Steel Hex Flange Self-Drilling Screws with EPDM Washer from China Suppliers - High-Quality Factory Fasteners

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Name: Stainless Steel Hex Flange Self-Drilling Screw with EPDM Washer
Material: 410 Stainless Steel / 304 Stainless Steel
Standard: DIN 7504-K / ISO 15480 / GB/T 15856.2
Grade: 410 (High Hardness HV 400-500), 304 (A2-70)
Sizes: M4.2 (#8), M4.8 (#10), M5.5 (#12), M6.3 (#14), Length: 13mm to 200mm
Surface Treatment: Electropolishing / Passivation
Design Features: Hexagonal flange head designed for high torque drive, EPDM Rubber sealing waterproof gaskets, high-hardness self-drilling tines for efficient installation, high-precision anti-slip threads, and a dual-material anti-corrosion system.
Applications: Ideal for light steel structures, color steel plate roofs, outdoor fences and protective facilities, sheet metal enclosures for electromechanical equipment, large outdoor advertising, signage, and combinations of wood and steel structures.
Delivery Time: 15-30 days upon receipt of advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable
Samples: Available
Packaging: Options include Boxed/Bulk/Pallet or customized packaging
OEM Services: Available from our factory.
As leading suppliers in China, we ensure high-quality manufacturing and customer satisfaction.

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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 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
    Dual Stainless Steel Options

    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.

    Self-Drilling Tip

    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.

    EPDM Sealing Washer

    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

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    What are the differences between 304 and 410 stainless steel screws?
    410 stainless steel is hardened for high torque and better penetration in heavy-duty applications, while 304 stainless steel offers superior corrosion resistance, making it ideal for coastal or outdoor environments.
    Does the EPDM washer provide a complete waterproof seal?
    Yes, the pre-installed EPDM washer is designed for IP68 leak-proof protection. It forms an elastic seal under compression that blocks rain and moisture, even under extreme temperatures.
    Do these screws require pre-drilling before installation?
    No, the self-drilling tip allows for drilling, tapping, and fastening in a single step, significantly improving installation efficiency on steel and aluminum profiles.
    What customization options do you offer for these screws?
    We offer flexible customization for head and slot shapes, special materials, extra-long specifications, surface treatment colors, and personalized packaging.
    How do you ensure the quality of the raw materials?
    We implement raw material source locking and maintain full traceability for every furnace number batch, supported by third-party material certifications.
    What technical support is available for international clients?
    We provide on-site failure analysis, BOM optimization, installation guidance, VMI inventory management, and free sample testing for our global partners.