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304 Stainless Steel Countersunk Self-Tapping Screws from China Suppliers - High Strength Factory Direct M4.2, M5.5, M6.3

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Name: Phillips Head Countersunk Self-Drilling Self-Tapping Screw
Material: Premium 304/316 Stainless Steel
Standards: Compliant with ISO, GB, BS, DIN, ANSI
Sizes Available: M3.5 / M4 / M4.2 / M4.8 / M5 / M6
Length Options: Ranging from 13mm to 100mm (customizable to meet your needs)
Surface Treatments: Choose from zinc plating, nickel plating, passivation, tin plating, sandblasting, anodizing, polishing, electrophoretic coating, hot-dip galvanizing (HDG), among others.
Design Features: Premium countersunk head design for flush finishes, self-drilling tail for easy installation, self-tapping thread, crafted from durable stainless steel
Applications: Ideal for steel structure engineering, architectural decoration, hardware furniture, and outdoor facilities
Delivery Time: Prompt delivery within 15-30 days after advance payment
Origin: Made in Chengdu, China
Brand: JGD
Minimum Order Quantity: 10,000 pieces (negotiable options available)
Samples: Samples available upon request
Packaging: Options for boxed, bulk, pallet, or custom packaging
OEM: Custom manufacturing available

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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

    • 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

    Core Product Advantages

    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.

    All-in-One Connections

    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 advanced technologies are used in your manufacturing process?
    We utilize Multi Station Cold Heading Technology, Intelligent Heat Treatment Systems, and Micron-Level Thread Rolling to ensure the highest precision and durability for our fasteners.
    How do you ensure the quality and traceability of the screws?
    Our quality control system includes raw material source locking, full batch traceability by furnace number, and real-time salt spray test monitoring to comply with international standards.
    Can I order screws with custom specifications?
    Yes, we offer flexible customization for head and slot shapes, special materials, extra-long specifications, and personalized packaging or labeling to meet your specific project needs.
    Do your self-tapping screws require pre-drilling?
    Our self-drilling tip design allows for direct drilling and fastening into metal or wood without the need for pre-drilling, which significantly improves construction efficiency.
    What kind of technical support do you offer?
    We provide comprehensive technical services, including on-site failure analysis, selection calculations, BOM optimization, installation guidance, and free sample making.
    Are these screws compatible with automated assembly lines?
    Absolutely. Our precisely controlled Phillips recess design ensures tight engagement with driver bits, preventing stripping and making them ideal for high-speed automated assembly.