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Black Oxide Hex Flange Self-Drilling Screws 410 Stainless Steel - China Suppliers & Factory for Metal Roofing

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Name: Hex Flange Self-Drilling Screw
, Material: 410 Stainless Steel / Medium Carbon Steel
, Standard: DIN 7504-K / ISO 15480 / GB/T 15856.2
, Grade: 410 (High Hardness HV 400-500), 8.8-10.9 Grade Carbon Steel
, Specifications: M4.2 (#8), M4.8 (#10), M5.5 (#12), M6.3 (#14), Length 13mm - 150mm
, Surface Treatment: Black Dacromet / Blackened Coating
, Design Features: Integrated hexagonal flange head, double-edged hardened drill tip, deep, wide-pitch thread, black anti-corrosion coating, one-piece molded waterproof structure
, Applications: Ideal for high-end dark metal roofing and wall cladding, solar photovoltaic mounting systems, black sheet metal and electromechanical equipment, as well as 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 for quality assurance
, Packaging: Available in Boxed/Bulk/Pallet options or customized packaging
, OEM: Available to meet specific requirements
, As a leading supplier and factory of hex flange self-drilling screws in China, we ensure high-quality products tailored to 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

    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 Capability

    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
    Black Dacromet Coating

    Black Dacromet/Black Oxide Coating

    Finished with black Dacromet or black oxide, forming a dense anti-corrosion layer that resists moisture, salt spray, and industrial atmospheric corrosion – while meeting the aesthetic needs of high-end dark metal roofing, solar mounting systems, and black sheet metal. Strong adhesion with no chipping or peeling; color stays stable and rust-free outdoors. The unified black finish perfectly blends with dark architecture and auto modification styles – no secondary painting needed.

    Dual-Blade Quenched Drill Tip

    Dual-Blade Quenched Drill Tip

    The drill tip is dual-blade quenched for high hardness and sharp edges, quickly penetrating steel sheets, light-gauge studs, and steel profiles with low resistance and no deviation. The deep wide-pitch thread design speeds up driving while increasing thread-to-substrate contact area for stronger holding power. Combined with the one-piece hex flange head, power wrenches deliver high torque without cam-out – fast and effortless installation.

    Flange Anti-Slip Teeth

    Flange Anti-Slip Teeth + Hardened Substrate

    The hex flange bottom features anti-slip teeth that bite into the substrate during tightening, creating mechanical locking against wind pressure, vibration, and thermal expansion. 410 stainless steel (HV 400-500) or Grade 8.8-10.9 carbon steel substrate offers high tensile strength, withstanding long-term cyclic loads without fatigue or deformation. Durability-tested, this screw maintains permanent locking in solar mounting systems and metal roofing.

    Factory Environment

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    Q1: What materials are these self-tapping screws made of?
    We offer high-quality 410 stainless steel (hardened for drilling) and Grade 8.8 to 10.9 carbon steel substrates, ensuring high tensile strength and durability for various industrial applications.
    Q2: How does the Black Dacromet coating benefit my project?
    Black Dacromet provides superior corrosion resistance against salt spray and moisture while offering a stable, non-peeling dark aesthetic that blends perfectly with solar mounting systems and dark metal roofing.
    Q3: Can I request custom head shapes or special dimensions?
    Yes, our flexible customization capability allows for customizable head/slot shapes, extra-large or long specifications, and special material applications to meet specific engineering requirements.
    Q4: Are these screws vibration-resistant for roofing?
    Absolutely. Our screws feature hex flange anti-slip teeth that bite into the substrate, creating a mechanical lock that resists wind pressure, thermal expansion, and vibration.
    Q5: Do you provide technical support for installation?
    We offer comprehensive technical services including on-site failure analysis, installation tool selection guidance, and selection calculations to optimize your BOM.
    Q6: Is the quality of the raw materials traceable?
    Yes, we implement a strict Quality Control System with raw material source locking and furnace number batch full traceability, accompanied by third-party material certifications.