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

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, wall cladding, solar photovoltaic mounting systems, black sheet metal and electromechanical equipment, 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 upon request
Packaging: Customizable options including Boxed, Bulk, and Pallet packaging
OEM: Available
As a leading factory and supplier in China, we guarantee high-quality products tailored to meet your needs.

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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

    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.

    Dual-Blade 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.

    Flange 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 available for these self-tapping screws?
    A: We offer 410 stainless steel (hardened to HV 400-500) and high-strength carbon steel (Grade 8.8-10.9) to meet various load and hardness requirements.
    Q2: How does the Black Dacromet coating benefit my project?
    A: It provides superior corrosion resistance against salt spray and moisture while offering a premium dark aesthetic that blends perfectly with solar mounting and dark roofing systems.
    Q3: Can the head shapes and sizes be customized?
    A: Yes, we provide flexible customization for head shapes, slot types, and extra-long or extra-large specifications to fit specific industrial applications.
    Q4: Are your products fully traceable?
    A: Absolutely. Our quality control system includes furnace number batch traceability and third-party material certification for every production run.
    Q5: What technical support do you provide for installation?
    A: We offer on-site failure analysis, selection calculations, BOM optimization, and guidance on choosing the correct installation tools.
    Q6: Do you offer samples for testing?
    A: Yes, we provide free sample making and testing services to ensure our screws meet your specific application requirements before bulk production.