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Stainless Steel Self-Drilling Screws with EPDM Washer - China Factory Suppliers, Hex Flange Fasteners for Versatile Applications

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Name: Stainless Steel Hex Flange Self-Drilling Screw with EPDM Washer
Material: Premium 410 and 304 Stainless Steel
Standards: Manufactured according to DIN 7504-K, ISO 15480, and GB/T 15856.2
Grade: 410 (High Hardness HV 400-500), 304 (A2-70)
Sizes: Available in M4.2 (#8), M4.8 (#10), M5.5 (#12), M6.3 (#1with lengths ranging from 13mm to 200mm
Surface Treatment: Electropolishing and Passivation for enhanced durability
Design Features: Features a hexagonal flange head designed for high torque, EPDM rubber sealing waterproof gaskets, high-hardness self-drilling tines, precision anti-slip threads, and a dual-material anti-corrosion system
Applications: Ideal for light steel structures, color steel plate roofs, outdoor fences, protective facilities, electromechanical equipment enclosures, large outdoor advertising, signage, and wood-steel structure combinations
Delivery Time: 15-30 days post receipt of 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 packaging
OEM: Available for tailored solutions
Our stainless steel hex flange self-drilling screws are manufactured in China, ensuring quality and reliability. As a leading supplier with our own factory, we guarantee superior products that meet your needs.

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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

    Professional Manufacturing Advantages

    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
    Customization Capability

    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

    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

    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.

    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 is the difference between 304 and 410 stainless steel screws?
    304 stainless steel offers superior corrosion resistance, making it ideal for outdoor and coastal environments. 410 stainless steel is heat-treatable and significantly harder, allowing it to penetrate harder substrates with higher torque.
    Do these screws require pre-drilling?
    No, these screws feature a hardened self-drilling tip designed to drill, tap, and fasten in one single operation, saving significant installation time.
    How effective is the EPDM washer for waterproofing?
    The EPDM washer provides an IP68-level seal. It is designed to resist UV and ozone, maintaining its elastic sealing properties in temperatures ranging from -40°C to 120°C.
    Can I request customized head shapes or colors?
    Yes, we provide flexible customization for head shapes, slot types, and surface treatment colors to meet specific aesthetic or functional requirements.
    What quality standards do your products comply with?
    Our manufacturing process follows international standards with full traceability. Each batch undergoes rigorous testing in our metallographic and mechanical laboratory.
    Do you offer technical support for failure analysis?
    Yes, we provide on-site failure analysis, selection calculations, and BOM optimization as part of our comprehensive technical service.