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

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Name: 304 Stainless Steel External Expansion Anchor Bolt
, Material: Crafted from high-quality 304 Stainless Steel, featuring an ultimate tensile strength of ≥520MPa and a yield strength of ≥205MPa.
, Standards: Manufactured according to ETAG 001, ASTM F1554, and GB/T 22795 guidelines.
, Grade: Stainless Steel Grade A2-70, Carbon Steel Grades 4.8 / 8.8.
, Specifications: Available in sizes M6 to M16, with lengths customizable from 60mm to 200mm.
, Surface Treatment: Stainless Steel options include mirror polishing and passivation for enhanced acid and alkali resistance, as well as seawater corrosion resistance. Carbon Steel options feature yellow zinc coating or blue-white zinc electroplating for rust-proof durability.
, Design Features: Designed with a hexagonal nut for effective drive force, external expansion sliding tension, and an extended tube design made from high corrosion-resistant 304 stainless steel for smooth insertion.
, Applications: Ideal for various applications, including building structures, reinforcement tasks, heavy equipment installations, outdoor safety protection facilities, use in aerated concrete blocks, thick wall applications, and industrial plants with warehouse racking.
, Delivery Time: 15-30 days upon receipt of advance payment.
, Origin: Proudly 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: OEM services available.
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, As a leading supplier based in China, our factory specializes in high-quality 304 stainless steel external expansion anchor bolts that meet diverse industrial needs. Contact us today for your 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.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws04

    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
    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 for decades.

    External Sliding Expansion

    External Sliding Expansion – Deep Anchoring

    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 strength. The extended sleeve design is tailored for thick walls and aerated blocks, delivering anchoring depth far beyond ordinary bolts.

    Fatigue Resistance

    Fatigue Resistance – Heavy Loads Secure

    The extended sleeve not only increases anchoring depth but also disperses load stress, reducing edge concentration and enhancing fatigue performance. Proven in cyclic pull-out tests, this anchor withstands alternating loads in heavy equipment and warehouse racking without shifting or loosening.

    Factory Environment

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    Product Display Video

    Frequently Asked Questions

    What are the advantages of using 304 stainless steel for these anchors?
    AISI 304 stainless steel provides superior corrosion resistance against acids, alkalis, and seawater. It ensures structural integrity and a rust-free service life for decades in harsh environments.
    How does the external sliding expansion mechanism improve anchoring?
    The mechanism grips the hole wall 360° uniformly as the nut is tightened. This design maximizes tensile and shear strength, especially in thick or insulated composite walls.
    Can these screws be customized for specific industrial requirements?
    Yes, we offer flexible customization for head/slot shapes, special materials, extra-long specifications, and personalized surface treatment colors or packaging.
    Are these anchors suitable for heavy equipment installation?
    Absolutely. Our extended design is specifically tested for fatigue resistance and can withstand alternating loads in heavy equipment and industrial warehouse racking.
    How do you ensure the quality of each batch?
    We implement full traceability via furnace number batches, use intelligent heat treatment, and conduct 100% optical sorting alongside third-party material certifications.