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China 410/304 Stainless Steel Countersunk Self-Drilling Screws - Top Suppliers & Factory Direct

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Introducing our premium Stainless Steel Countersunk Phillips Self-Drilling Tek Screws, crafted from high-quality 410 and 304 stainless steel. As a leading supplier and factory based in China, we adhere to international standards such as DIN 7504P and ANSI/ASME, ensuring reliability and performance for various applications.

Our screws are available in sizes M3.5, M4.2, M4.8, M5.5, and M6.3 (American Standard #6, #8, #10, #12, #14), with lengths ranging from 13mm to 120mm. The 410 grade offers high hardness and maximum self-drilling torque, while the 304 grade (A2-70) provides excellent corrosion resistance.

Key features include a self-drilling design that eliminates the need for pre-drilling, countersunk heads for a flush finish, and tight threaded anti-slip interlocking. The electropolished and passivated surface treatments enhance rust prevention and durability, making them ideal for applications in light steel keel and steel structure ceilings, furniture assembly, metal door and window installations, and automobile manufacturing.

We offer flexible delivery times of 15-30 days after receiving advance payment and a minimum order quantity of 10,000 pieces, negotiable based on your needs. Samples are available upon request, and we provide various packaging options, including boxed, bulk, pallet, or customized packaging. OEM services are also available. Choose us as your trusted partner in sourcing high-quality screws from a reputable Chinese factory.

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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
    Dual Stainless Steel Options

    Dual Stainless Steel Options

    Available in 410 and 304 stainless steel. 410 grade, heat-treated for high hardness, delivers high driving torque to penetrate thick steel sheets; 304 grade (A2-70) offers excellent corrosion resistance for outdoor environments.

    Self-Drilling Tip

    Self-Drilling Tip

    The built-in self-drilling tip penetrates light-gauge steel and aluminum profiles directly—no pre-drilling needed. One step completes drilling, tapping, and fastening, significantly boosting productivity.

    Countersunk Flat Head

    Countersunk Flat Head

    The countersunk flat head fully embeds into the workpiece surface, sitting flush with panels—no protrusion, sleek appearance, and no interference with subsequent painting or finishing.

    Factory Environment

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    Q1: What is the difference between 304 and 410 stainless steel screws?
    A: 304 stainless steel offers superior corrosion resistance, ideal for outdoor or damp environments. 410 stainless steel is heat-treatable, providing higher hardness for penetrating harder metal sheets.
    Q2: Do these screws require pre-drilling?
    A: No, our self-drilling tip design allows the screw to drill its own hole and tap its own thread in one operation, saving time and labor.
    Q3: Can the head shape and size be customized?
    A: Yes, we offer flexible customization for head shapes, slot types, and extra-long or extra-large specifications to meet specific application needs.
    Q4: How do you ensure the quality and traceability of the screws?
    A: We implement a full traceability system based on furnace numbers and batches, supported by third-party material certifications and real-time salt spray monitoring.
    Q5: What technical support do you provide for product selection?
    A: We provide selection calculations, BOM optimization, on-site failure analysis, and installation tool guidance to ensure the best fastening solution.
    Q6: Are the surface treatments environmentally friendly?
    A: Yes, we utilize environmentally friendly surface treatment lines that comply with international environmental standards.