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China Factory Suppliers of Galvanized Fish-Scale Hollow Wall Expansion Anchors for Heavy-Duty Applications

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Name: Galvanized Fish-Scale Multi-Segment Expansion Anchor
Material: Premium High-Quality Carbon Steel
Standards: Compliant with GB, DIN, and ANSI Regulations
Grade: 4.8 / 8.8 (High Strength)
Sizes: Available in M6, M8, M10, M12, M14, M16 (Length ranging from 60mm to 200mm, customizable in multiple segments)
Surface Treatment: Eco-friendly blue-white zinc or yellow zinc finish
Design Features: Equipped with sharp fish-scale double-edged barbs, a multi-segment expansion structure, top ring-shaped anti-slip knurling, compatibility with multiple head shapes, and a hot-dip galvanized anti-corrosion protective layer
Applications: Ideal for reinforcing hollow brick and perforated brick walls, installing door and window profiles and curtain walls, supporting heavy-duty railings and outdoor structures, suspending ceilings, and hoisting pipelines, as well as for industrial equipment and shelving installations
Delivery Time: 15-30 days after receiving 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 Services: Available to meet your needs
As a leading factory and supplier in China, we ensure high-quality manufacturing and reliable service.

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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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    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
    Sharp Fish-Scale Bidirectional 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 Staged 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.

    Dual Corrosion Protection + Anti-Slip Knurling

    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 (FAQ)

    What manufacturing processes are used for your self-tapping screws?
    Our screws are manufactured using multi-station cold heading technology, intelligent heat treatment systems, and a micron-level thread rolling process, followed by fully automatic optical sorting to ensure the highest dimensional precision.
    How do the fish-scale barbs prevent the screws from loosening in hollow bricks?
    The sharp bidirectional fish-scale barbs spiral along the sleeve surface. When tightened, they bite directly into the inner webs of hollow bricks, locking the anchor in place and preventing rotation or slipping under pull-out stress.
    What is the advantage of multi-segment staged expansion?
    Multi-segment staged expansion allows each part of the sleeve to open sequentially during installation. This progressive contact compensates for drilling deviations and distributes forces evenly, preventing stress concentrations that could crack fragile hollow bricks.
    What kind of customization capabilities do you support?
    We offer comprehensive customization services, including custom head and slot shapes, special material selections, extra-large or extra-long specifications, custom surface treatment colors, and personalized packaging and labeling.
    How do you guarantee the quality and corrosion resistance of the fasteners?
    We secure raw material sources with furnace-number batch traceability and provide third-party certifications. Additionally, our fasteners receive dual corrosion protection (blue-white or yellow zinc plating) and undergo real-time salt spray monitoring.