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Stainless Steel Countersunk Self-Drilling Screws from China Suppliers - Durable 410/304 Factory Direct

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Name: Stainless Steel Countersunk Phillips Self-Drilling Tek Screw
Material: 410 Stainless Steel / 304 Stainless Steel
Standards: DIN 7504P / ANSI / ASME
Grade: 410 (high hardness and exceptional self-drilling torque); 304 (A2-70)
Sizes: M3.5, M4.2, M4.8, M5.5, M6.3 (American Standard #6, #8, #10, #12, #14), Lengths: 13mm to 120mm
Surface Treatment: Electropolished / Passivation Treatment
Design Features: Our self-drilling screws eliminate the need for pre-drilling, featuring a countersunk head for a flush fit. Available in dual material options of 410 and 304 stainless steel, these screws offer tight threaded anti-slip interlocking and mirror passivation for enhanced rust prevention.
Applications: Ideal for light steel keel and steel structure ceilings; furniture and sheet metal assembly; metal doors, windows, and curtain wall installation; automobile and vehicle manufacturing; outdoor advertising and signage.
Delivery Time: 15-30 days after receiving advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable
Samples: Available for review
Packaging: Boxed, bulk, pallet, or customized packaging available
OEM Service: Available for unique requirements
As a leading supplier and factory in China, we ensure our stainless steel screws meet the highest quality standards, providing reliable solutions for various applications.

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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
    Dual Stainless Steel Options
    Dual Stainless Steel Options – High Hardness or Superior Corrosion Resistance

    Available in 410 and 304 stainless steel. 410 grade, heat-treated for high hardness, delivers high driving torque to penetrate thick steel sheets and light-gauge studs without tip wear or breakage; 304 grade (A2-70) offers excellent corrosion resistance for damp, salt-spray, and outdoor environments – rust-free for decades. One screw, two materials – choose according to working conditions, meeting both hardness and anti-corrosion needs.

    Self-Drilling Tip
    Self-Drilling Tip – No Pre-Drilling, Efficient One-Step Installation

    The built-in self-drilling tip penetrates light-gauge steel, thin metal sheets, aluminum profiles, and sheet metal directly – no pre-drilling or punching needed. An electric driver completes drilling, tapping, and fastening in one step – several times faster than conventional self-tapping screws. Ideal for high-volume assembly in drywall framing, metal windows/curtain walls, and automotive manufacturing – significantly boosting productivity.

    Countersunk Flat Head
    Countersunk Flat Head – Flush Fit, Aesthetic & Non-Interfering

    The countersunk flat head fully embeds into the workpiece surface, sitting flush with metal panels, profiles, or curtain walls – no protrusion, sleek appearance, and no interference with subsequent painting, film application, or decorative finishing. Burr-free head prevents scratching of operators and materials. Tight threads provide anti-slip locking against vibration, maintaining clamping force long-term – perfect for furniture sheet metal, signboards, and other high-aesthetic applications.

    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?
    We offer both 410 stainless steel for high hardness and 304 stainless steel (A2-70) for superior corrosion resistance, allowing you to choose based on your specific application environment.
    Q2: Do these screws require pre-drilling before installation?
    No, our screws feature a built-in self-drilling tip that can penetrate light-gauge steel and aluminum profiles directly, completing drilling, tapping, and fastening in one efficient step.
    Q3: Are the screw heads flush after installation?
    Yes, the countersunk flat head design allows the screw to sit flush with the surface, providing a sleek appearance without any protrusion or interference with finishing.
    Q4: Can I request custom head shapes or packaging?
    Absolutely. Our flexible customization capability includes custom head/slot shapes, special material applications, and personalized packaging or labeling to meet your specific requirements.
    Q5: How do you ensure the quality of each batch?
    We maintain a strict quality control system including raw material source locking, furnace number batch full traceability, and real-time monitoring of salt spray tests.
    Q6: Do you provide technical support for selection?
    Yes, our technical service includes on-site failure analysis, selection calculations, BOM optimization, and guidance on installation tool selection.