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High-Quality Black Oxide Hex Flange Self-Drilling Screws from China Suppliers | 410 Stainless Steel Factory Fasteners

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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: This high-performance Hex Flange Self-Drilling Screw is ideal for high-end applications including dark metal roofing, wall cladding, solar photovoltaic mounting systems, black sheet metal, and electromechanical equipment. It is also perfect for 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
Packaging: Boxed/Bulk/Pallet or customized packaging
OEM: Available
We are a leading factory and supplier in China, committed to delivering quality products efficiently. Contact us today for more information and to discuss your order!

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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    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 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
    Black Dacromet Coating
    Black Dacromet/Black Oxide Coating – Corrosion Protection & Dark Aesthetics

    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.

    Quenched Drill Tip
    Dual-Blade Quenched Drill Tip + Deep Wide-Pitch Threads – Fast Penetration & Tight Bite

    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.

    Anti-Slip Teeth
    Flange Anti-Slip Teeth + Hardened Substrate – Vibration-Resistant & Stable Under Load

    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.

    Factory Environment
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    High-Quality Stainless Steel Self-Tapping Screw Display
    Frequently Asked Questions
    Q1: What materials are your self-tapping screws made of?
    Our screws are manufactured using high-quality 410 stainless steel (HV 400-500) or Grade 8.8-10.9 carbon steel substrates, ensuring high tensile strength and durability for industrial applications.
    Q2: How does the Black Dacromet coating benefit my project?
    The Black Dacromet or Black Oxide coating provides a dense anti-corrosion layer that resists moisture and salt spray. It is specifically designed for dark metal roofing and solar mounting systems where aesthetics and weather resistance are critical.
    Q3: Do you offer customization for specific head or slot shapes?
    Yes, we have flexible customization capabilities. We can customize head shapes, slot types, surface treatment colors, and even produce extra-large or extra-long specifications to meet your unique engineering requirements.
    Q4: How do you ensure the quality and traceability of your products?
    We implement a strict quality control system including raw material source locking, furnace number batch full traceability, and third-party material certification. All process parameters are open and transparent for our clients.
    Q5: Can I get samples before placing a bulk order?
    Absolutely. We offer free sample making and testing as part of our technical service to ensure the screws meet your specific application needs before full-scale production.
    Q6: Are these screws resistant to loosening from vibrations?
    Yes, our screws feature hex flange anti-slip teeth that bite into the substrate during tightening. This creates a mechanical lock that is highly resistant to wind pressure, thermal expansion, and mechanical vibrations.