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304 Stainless Steel Hex Sleeve Anchor Bolts - Heavy Duty External Expansion Wall Anchors from China Suppliers & Factory

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Name: 304 Stainless Steel External Expansion Anchor Bolt
Material: Made from high-quality 304 Stainless Steel (ultimate tensile strength ≥520MPa, yield strength ≥205MPa), ensuring maximum durability and strength.
Standards: Manufactured according to ETAG 001, ASTM F1554, and GB/T 22795 standards, guaranteeing exceptional quality and performance.
Grade: Available in Stainless Steel A2-70 and Carbon Steel Grade 4.8 / Grade 8.8, suitable for diverse applications.
Specifications: Ranging from M6 to M16 in size, with customizable lengths from 60mm to 200mm to meet your specific requirements.
Surface Treatment: Our stainless steel options feature a mirror-polished and passivated finish that is acid and alkali resistant, as well as seawater corrosion resistant. Carbon steel alternatives are available with yellow zinc coating or blue-white zinc electroplating for rust-proofing and wear resistance.
Design Features: Engineered with a hexagonal nut for enhanced drive force, external expansion sliding tension, and an extended tube design. Our high corrosion-resistant 304 stainless steel ensures a smooth tube body for effortless insertion.
Applications: Ideal for building structures and reinforcement, heavy equipment installations, outdoor safety protection facilities, aerated concrete blocks, thick wall applications, and industrial plant and warehouse racking.
Delivery Time: Fast delivery within 15-30 days after receiving advance payment.
Origin: Proudly manufactured in China by experienced suppliers and factories.
Brand: JGD
Minimum Order Quantity: Starting from 10,000 pieces, with negotiable terms available.
Samples: Available for evaluation.
Packaging: Offered in boxed, bulk, or pallet options, or customized packaging as per your needs.
OEM: Customization options available to suit your specific requirements.

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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 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
    304 Stainless Steel

    304 Stainless Steel – Corrosion & Aging Resistant

    Made of AISI 304 stainless steel (A2-70), with ultimate tensile ≥520MPa and yield ≥205MPa. Mirror-polished and passivated for a dense chromium oxide film that effectively resists acids, alkalis, seawater, and industrial pollutants. Ideal for coastal construction, outdoor safety facilities, and damp factories – remains rust-free and pit-free for decades, with consistent anchoring strength, eliminating structural risks caused by corrosion.

    External Sliding Expansion

    External Sliding Expansion – Deep Anchoring in Thick Walls

    The external sliding expansion mechanism – as the hex nut is tightened, the tapered screw expands the sleeve uniformly outward, gripping the hole wall 360° for high tensile and shear strength. The extended sleeve design is tailored for thick walls, aerated blocks, and insulated composite walls – delivering anchoring depth far beyond ordinary bolts, fully utilizing the substrate's deep-layer strength. Smooth sleeve body ensures easy insertion, making installation fast and efficient.

    Extended Design

    Extended Design for Fatigue Resistance – Heavy Loads Stay Secure

    The extended sleeve not only increases anchoring depth but also disperses load stress, reducing edge concentration at the hole mouth and enhancing overall fatigue performance. Proven in cyclic pull-out and vibration tests, this anchor withstands alternating loads in heavy equipment, warehouse racking, and industrial plants – no shifting, no loosening. The mirror-polished surface reduces installation friction and protects hole integrity, offering a service life far exceeding standard galvanized carbon steel anchors with minimal maintenance costs.

    Factory Environment

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    What are the primary benefits of using 304 Stainless Steel for anchors?
    304 Stainless Steel (A2-70) provides excellent corrosion resistance against acids, alkalis, and seawater. It maintains high tensile strength (≥520MPa) and structural integrity for decades, even in damp or coastal environments.
    How does the external sliding expansion mechanism work?
    As the hex nut is tightened, the tapered screw expands the sleeve uniformly outward, creating a 360° grip against the hole wall. This ensures high tensile and shear strength, especially in thick or insulated walls.
    Can these screws be customized for specific industrial applications?
    Yes, we offer flexible customization including specific head and slot shapes, extra large or long specifications, special material applications, and personalized packaging or labeling.
    What kind of quality control is implemented during manufacturing?
    Our quality control system includes raw material source locking, full batch traceability by furnace number, third-party material certification, and real-time salt spray test monitoring to ensure international standard compliance.
    Is technical support available for installation and selection?
    We provide comprehensive technical services, including on-site failure analysis, selection calculations, BOM optimization, installation tool guidance, and free sample testing.
    Are these anchors suitable for heavy equipment and high-vibration environments?
    Yes, the extended design is specifically engineered for fatigue resistance. It has been proven in cyclic pull-out and vibration tests to withstand alternating loads without shifting or loosening.