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China Suppliers Factory Galvanized Fish-Scale Hollow Wall Expansion Anchors and Wedge Bolts for Heavy-Duty Applications

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Name: Galvanized Fish-Scale Multi-Segment Expansion Anchor
, Material: Premium Carbon Steel
, Standards: Compliant with GB / DIN / ANSI
, Grade: High Strength 4.8 / 8.8
, Sizes: Available in M6, M8, M10, M12, M14, M16 (Lengths from 60mm to 200mm, customizable in various segments)
, Surface Treatment: Eco-friendly Blue-White Zinc / Yellow Zinc
, Design Features: Innovative sharp fish-scale double-edged barbs, multi-segment expansion structure, top ring-shaped anti-slip knurling, compatible with a variety of head shapes, and a hot-dip galvanized anti-corrosion protective layer
, Applications: Ideal for hollow brick/perforated brick wall reinforcement, door and window profiles, curtain wall installation, heavy-duty railings, outdoor supports, ceiling suspension, pipeline hoisting, and assembling industrial equipment and shelving
, Delivery Time: 15-30 days upon advance payment
, Origin: China
, Brand: JGD
, Minimum Order Quantity: 10,000 pieces, negotiable
, Samples: Available upon request
, Packaging: Options include Boxed, Bulk, Pallet or customized packaging
, OEM: Available
, Connect with leading China suppliers and manufacturers to enhance your project with high-quality multi-segment expansion anchors from our 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.
    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

    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
    Sharp Fish-Scale Barbs

    Sharp Fish-Scale Bidirectional Barbs – Anti-Rotation & Bite in Hollow Bricks

    Sharp fish-scale barbs spiral along the surface, embedding into hollow brick walls to prevent rotation and slipping. Under rotation or pull-out stress, they anchor firmly, offering several times higher holding power than smooth sleeves – ensuring permanent, non-shifting fixing for curtain walls and heavy railings.

    Multi-Segment Expansion

    Multi-Segment Staged Expansion – Progressive Wall Contact for Superior Reliability

    Unique multi-segment staged expansion – each petal opens sequentially during tightening, progressively pressing against the hole wall. The design compensates for hole deviations, ensuring full contact and even force distribution, avoiding stress concentration that could crack hollow bricks – ideal for porous and lightweight blocks.

    Corrosion Protection

    Dual Corrosion Protection + Anti-Slip Knurling – Built to Last

    Carbon steel with blue-white or yellow zinc plating resists moisture and mild corrosion for indoor/outdoor use. Top anti-slip knurling provides friction during tightening, preventing cam-out and ensuring torque accuracy. Fatigue-tested, it resists loosening under vibration, with long replacement cycles in railings and racking.

    Factory Environment

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    Q1: What makes these screws suitable for hollow bricks?
    Our screws feature sharp fish-scale bidirectional barbs and multi-segment staged expansion. This combination ensures the screw "bites" into the hollow sections and expands progressively to distribute force evenly, preventing the brick from cracking.
    Q2: What materials and surface treatments do you offer?
    We utilize high-quality carbon steel and 304 stainless steel. Surface treatments include blue-white zinc plating, yellow zinc plating, and other environmentally friendly coatings to ensure excellent corrosion resistance.
    Q3: Can I request custom sizes or head shapes?
    Yes, we have flexible customization capabilities. We can customize head shapes, slot types, extra-long specifications, and even special materials to meet your specific project requirements.
    Q4: How do you ensure the quality of each batch?
    We maintain a full traceability system using furnace numbers. Our process includes multi-station cold heading, intelligent heat treatment, and 100% fully automatic optical sorting to ensure micron-level precision.
    Q5: Do you provide technical support for selection?
    Absolutely. We offer on-site failure analysis, selection calculations, BOM optimization, and guidance on installation tool selection to ensure you have the most reliable fastening solution.
    Q6: Are free samples available for testing?
    Yes, as part of our technical service, we offer free sample making and testing to ensure our products meet your mechanical and metallographic standards before bulk orders.