Get A Quote!
Leave Your Message
1.png
3.jpg
2.jpg
4.jpg
5.jpg

Hardened Hex Head Self-Drilling Screws with EPDM Washers - China Suppliers & Factory, Heavy Duty Tek Drill Fasteners

,

Name: Hex Washer Head Self-Drilling Roofing Screw with EPDM Washer
Material: High-Grade Hardened Carbon Steel
Standard: Complies with DIN 7504 / ISO 15480 / GB/T 15856.2
Grade: 8.8 / 10.9
Specifications: Available in Diameters: M4.2, M4.8, M5.5, M6.3 (Imperial: #8, #10, #12, #1and Lengths: 13mm - 200mm
Surface Treatment: Environmentally-friendly high-gloss yellow zinc plating
Design Features: Features a hardened milled drill tip, integrated EPDM rubber sealing gasket, a hexagonal flange with an oversized head design, custom markings for easy identification, as well as a special thread pitch and high-strength threads
Applications: Ideal for light steel structures, corrugated steel roofs/walls, outdoor billboards, large signage, ventilation ducts, HVAC engineering, timber roof trusses, outdoor installations, automotive modifications, and vehicle manufacturing
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: Available in Boxed, Bulk, Pallet, or customized options
OEM: Custom manufacturing available for specific needs
As leading China suppliers and factory for roofing solutions, we are committed to providing high-quality products that meet industry standards.

,
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
    Contact us
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws02
    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
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws03
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws04

    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.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws04
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws05
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws06

    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.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws08
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws07
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws03

    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.

    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.

    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.

    Factory Environment
    Factory Photo 1
    Factory Photo 2
    Factory Photo 3
    Factory Photo 4
    Factory Photo 5
    High-Quality Screw Display
    Frequently Asked Questions
    Do these screws require pre-drilling?
    No, our hardened drill tip screws are designed for one-step penetration, meaning they can drill, tap, and fasten directly into steel sheets and structural steel without any pre-drilling.
    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, ensuring long-term protection against moisture.
    Can I customize the screw head or color?
    Yes, we offer flexible customization capabilities including various head shapes, slot types, and surface treatment colors to meet your specific project requirements.
    What materials are available for these fasteners?
    We provide fasteners in various materials, including high-grade carbon steel (8.8/10.9) and 304/316 stainless steel, depending on your application needs.
    How do you ensure the quality of each batch?
    Our quality control system includes full traceability of furnace numbers, third-party material certification, and real-time monitoring of salt spray tests and process parameters.
    Are these screws suitable for outdoor use?
    Absolutely. With high-quality zinc plating or stainless steel options combined with EPDM washers, our screws are specifically engineered for long-term outdoor durability and corrosion resistance.