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Heavy Duty 304 Stainless Steel & Carbon Steel Countersunk Expansion Bolts - China Suppliers & Factory Direct

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Product Name: Window Frame Sleeve Anchor / Countersunk Cross Recessed Expansion Bolt
, Material: Dual-material composite process ensuring durability
, Standards: Compliant with ETAG 001 and GB/T 22795
, Grade: Carbon Steel options include 4.8 grade and 8.8 grade; Stainless Steel available in A2-70 (304)
, Specifications: Ranges from M6 to M16 (with custom lengths available from 50mm to 200mm)
, Surface Treatment: Carbon Steel finishes include blue-white zinc, environmentally friendly color zinc, and yellow color zinc; Stainless Steel features 360° electrolytic polishing or a natural brushed finish
, Design Features: Innovative countersunk cross groove, long strip gap for effective expansion, high-interlocking diamond and anti-slip texture, multi-material composite for rust prevention, and superior tensile & shear strength
, Applications: Ideal for door and window curtain wall installations, railing and handrail fixation, building decoration keels, air conditioning and electromechanical equipment, and installation on solid brick/concrete substrates
, Delivery Time: 15-30 days post receipt of advance payment
, Origin: Manufactured in China
, Brand: JGD
, Minimum Order Quantity: 10,000 pieces, negotiable
, Samples: Available upon request
, Packaging: Offered in boxed, bulk, pallet, or customized options
, OEM: Available for tailored solutions
, Discover superior quality with our Window Frame Sleeve Anchor, sourced directly from reputable China suppliers and manufactured in our state-of-the-art factory.

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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01

    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

    • 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 Interpretation
    Dual-Material Composite

    Dual-Material Composite – Corrosion Resistance Inside & Out

    Made with a dual-material process: the sleeve is high-strength carbon steel (Grade 4.8/8.8) or 304 stainless steel, while all internal expansion wedges and screws are 304 stainless steel. This design ensures high tensile strength and rigidity from the sleeve, while critical threaded and wedge parts never rust. Even under long-term exposure to window condensation, rain, or humid conditions, internal components remain flexible and reliable – no seizing or failure due to corrosion.

    Countersunk Head

    Countersunk Cross Recess + Diamond Knurling – Flush Fit & Anti-Loosening

    The countersunk cross recess allows the head to fully embed into the workpiece surface, sitting flush with window frames and curtain wall profiles – aesthetic and never obstructing window operation. Long expansion slots combined with high-grip diamond/anti-slip textures enable 360° uniform expansion tightly against the hole wall, delivering excellent tensile and shear strength. Cross drive works with impact wrenches for easy installation, while diamond textures effectively resist vibration loosening.

    Wear Resistance

    Long-Lasting Wear Resistance for Harsh Climates

    Internal 304 stainless steel components are electrolytically polished for a smooth, wear-resistant surface; carbon steel sleeves are zinc-plated for overall superior fatigue performance. Proven in cyclic load tests, this anchor withstands decades of window vibration, temperature swings, and weather erosion without failure. The countersunk head is burr-free, protecting sealing gaskets.

    Factory Environment

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    Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    What materials are used in your dual-material composite anchors?
    We use a high-strength carbon steel or 304 stainless steel sleeve combined with internal 304 stainless steel expansion wedges and screws to ensure maximum strength and rust prevention.
    How does diamond knurling benefit the installation?
    The diamond/anti-slip texture provides 360° uniform expansion against the hole wall, significantly increasing tensile strength and preventing loosening caused by wind loads or vibrations.
    Are these screws suitable for coastal or humid environments?
    Yes. The use of 304 stainless steel for critical internal components and environmentally friendly surface treatments ensures long-term reliability even in humid or rainy conditions.
    Can I get a customized head shape or specific packaging?
    Absolutely. We offer flexible customization for head/slot shapes, surface colors, extra-long specifications, and personalized labeling or packaging.
    Do you provide technical support for product selection?
    Yes, our technical services include selection calculations, BOM optimization, on-site failure analysis, and installation tool guidance.
    Is your quality control process traceable?
    We maintain full traceability through furnace number batch tracking, source locking for raw materials, and real-time monitoring of salt spray tests.