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304 Stainless Steel Self-Tapping Screws - High Strength, Countersunk Head, China Suppliers & Factory

Introducing our premium Phillips Head Countersunk Self-Drilling Self-Tapping Screws, meticulously crafted from high-quality 304/316 stainless steel. We are a leading factory in China, committed to manufacturing screws that adhere to international standards such as ISO, GB, BS, DIN, and ANSI, Our screws are available in a variety of sizes, including M3.5, M4, M4.2, M4.8, M5, and M6, with customizable lengths ranging from 13mm to 100mm to meet your specific needs. We offer a diverse range of surface treatments, including zinc plating, nickel plating, passivation, tin plating, sandblasting, anodizing, polishing, and hot-dip galvanizing (HDG), ensuring durability and optimal performance, Designed with a countersunk head, self-drilling tail, and self-tapping thread, these screws are perfect for various applications such as steel structure engineering, architectural decoration, hardware furniture, and outdoor facilities, As one of the reputable suppliers in the industry, we guarantee a delivery time of 15-30 days upon receiving your advance payment. We offer a minimum order quantity of 10,000 pieces, which is negotiable, and samples are available for your convenience, Our packaging options include boxed, bulk, pallet, or customized packaging to suit your preferences. We also provide OEM services tailored to your requirements. Choose our high-quality screws for reliability and excellence in your projects!
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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
    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
    Efficient Operation

    Efficient Operation, Prevents Slippage

    We use a standard Phillips recess design with precisely controlled depth and angle, compatible with mainstream power tools to enhance installation efficiency. The recess is smooth and burr-free, ensuring tight engagement with the driver bit, effectively preventing slipping or stripping. Whether for manual or automated assembly, it enables quick fastening, improves work smoothness and safety, and is especially suitable for high-frequency usage scenarios.

    Precise Structure

    Precise Structure, More Reliable Fastening

    The screw threads are fully formed with clear profiles and smooth surfaces, ensuring uniform engagement depth with nuts or base materials. The thread run-out is naturally finished to avoid jamming or seizing, improving installation smoothness. The optimized thread structure enhances tensile and torsional strength, maintaining stable fastening effect during long-term use and reducing the risk of loosening.

    Drilling Tip

    All-in-One, Stronger Connections

    The self-drilling tip features a sharp point design, allowing direct drilling, tapping, and fastening on materials such as metal or wood without pre-drilling, significantly improving construction efficiency. The drilling process is stable with smooth chip removal, minimizing material damage. After fastening, it offers excellent pull-out resistance and vibration resistance, ensuring connections are not easily loosened, ideal for vibration environments or high-strength applications.

    Factory Environment

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    What manufacturing technologies ensure your screw quality?
    We utilize Multi Station Cold Heading technology, intelligent heat treatment, and micron-level thread rolling processes to ensure every screw meets high-precision standards.
    Can I request customized screw specifications?
    Yes, we offer flexible customization including specific head/slot shapes, special materials, extra-long specifications, and personalized packaging or labeling.
    How do you manage quality control and traceability?
    We implement raw material source locking and full furnace number batch traceability. All process parameters are transparent, and we provide third-party material certifications.
    Do these screws require pre-drilling?
    Our self-drilling screws feature a sharp point design that allows for direct drilling and tapping on metal or wood, eliminating the need for pre-drilling and improving efficiency.
    What technical support do you offer to clients?
    We provide comprehensive services including on-site failure analysis, selection calculations, BOM optimization, and guidance on installation tool selection.
    Are your screws compatible with automated assembly lines?
    Absolutely. Our standard Phillips recess design is precisely controlled for depth and angle to ensure tight engagement with power tools, preventing slippage during high-speed automated assembly.