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Heavy Duty Sleeve Anchor Bolts - Galvanized & Stainless Steel Expansion Anchors from China Suppliers & Factory

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Product Name: Sleeve Anchor Bolt (Expansion Sleeve Anchor)
, Material: Crafted from high-quality AISI 304 Stainless Steel for superior corrosion resistance and rust-proofing, alongside durable Q235 Carbon Steel.
, Standards: Manufactured in accordance with GB/T 22795, ETAG 001, and ASTM F1554 regulations.
, Grade: Available in .8 grade / 8.8 grade for carbon steel, and A2-70 (30/ A4-80 (31for stainless steel.
, Specifications: Sizes range from M6 to M24 with customizable options to meet specific needs.
, Surface Treatment: Features a variety of finishes including zinc-plated (color zinc / blue-white zinc) for carbon steel, hot-dip galvanized, and polished/passivated for stainless steel.
, Design Features: Innovative sleeve expansion structure, anti-slip knurled sleeve, comprehensive specification coverage, multiple material selections, and ease of installation.
, Applications: Ideal for building construction, equipment installation, municipal engineering, outdoor facilities, and general assembly.
, Delivery Time: Efficient delivery within 15-30 days upon receipt of advance payment.
, Origin: Proudly manufactured in China.
, Brand: JGD
, Minimum Order Quantity: Standard MOQ is 10,000 pieces; options available for negotiation.
, Samples: Samples available for evaluation.
, Packaging: Offered in boxed, bulk, pallet, or customized packaging options.
, OEM Services: OEM capabilities available to fulfill unique requirements.

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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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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

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    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
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    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
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    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
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    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-Material Sleeve Anchors

    Dual-Material & Full-Size Options

    Our sleeve anchors are available in Q235 carbon steel (grades 4.8/8.8) and AISI 304/316 stainless steel (A2-70/A4-80). Carbon steel versions with color zinc, blue-white zinc or hot-dip galvanized finishes offer excellent rust and wear resistance, while polished and passivated stainless steel provides natural corrosion resistance for coastal and humid environments. Sizes range from M6 to M24 with customizable lengths.

    Knurled Sleeve Design

    Knurled Sleeve & Secure Grip

    Featuring a non-slip knurled sleeve expansion design, the sleeve is evenly expanded against the concrete or masonry wall by the cone head when tightening the nut, forming a high-strength mechanical lock. The knurled surface significantly increases friction with the base material, effectively preventing anchor slip under load and offering excellent vibration resistance.

    Quick Installation Anchors

    Pre-Embedded-Free Quick Installation

    Installation is simple and efficient: just drill, clean the hole, insert the anchor and tighten the nut—no pre-embedding required, greatly reducing construction time and labor costs. The design is highly adaptable to a wide range of applications, including building curtain walls, municipal guardrails, equipment installation, and outdoor facilities.

    Application Scenarios

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    High-Quality Sleeve Anchor Bolt Display

    Frequently Asked Questions

    What materials are available for your sleeve anchor bolts?
    We offer anchors in Q235 carbon steel (Grades 4.8/8.8) and AISI 304/316 stainless steel (A2-70/A4-80) to suit various load and environmental requirements.
    What are the main advantages of the knurled sleeve design?
    The knurled sleeve increases friction against the base material, providing a secure, slip-resistant grip and excellent vibration resistance for heavy-duty applications.
    Do these anchors require pre-embedding before construction?
    No, these are designed for quick installation. You simply drill a hole, clean it, insert the anchor, and tighten—no pre-embedding is necessary.
    Can I request custom sizes or surface treatments?
    Yes, we provide customization for head shapes, slot types, extra large/long specifications, and various surface treatment colors and finishes like hot-dip galvanized or color zinc.
    What international standards do your products comply with?
    Our manufacturing and quality control processes comply with GB/T 22795 and ETAG 001 standards, ensuring reliable performance and safety.
    Are these anchors suitable for coastal or humid environments?
    Yes, our AISI 304 and 316 stainless steel options are polished and passivated to provide high natural corrosion resistance, making them ideal for coastal applications.