English
English French German Portuguese Spanish Russian Japanese Korean Arabic Turkish Italian Indonesian Polish Hindi Dutch Malay Persian Thai Vietnamese
Get A Quote!
Leave Your Message
1.png
2.jpg
3.jpg
4.jpg

Galvanized Fish-Scale Expansion Anchors - High-Quality China Suppliers & Factory for Heavy-Duty Applications

Name: Galvanized Fish-Scale Multi-Segment Expansion Anchor, Material: High-quality carbon steel, Standards: GB / DIN / ANSI, Grade: 4.8 / 8.8 (High strength), Sizes: M6, M8, M10, M12, M14, M16 (Length 60mm - 200mm, customizable in multiple sections), Surface Treatment: Environmentally friendly blue-white zinc / yellow zinc, Design Features: The innovative design includes sharp fish-scale double-edged barbs and a multi-segment expansion structure. The top ring-shaped anti-slip knurling ensures compatibility with various head shapes, while the hot-dip galvanized anti-corrosion protective layer enhances durability, Applications: Ideal for reinforcing hollow bricks and perforated brick walls, installing door and window profiles and curtain walls, supporting heavy-duty railings and outdoor structures, ceiling suspension, pipeline hoisting, and industrial equipment shelving, Delivery Time: 15-30 days after receiving advance payment, Origin: China, Brand: JGD, Minimum Order Quantity: 10,000 pieces, negotiable, Samples: Available, Packaging: Boxed/Bulk/Pallet or customized packaging, OEM: Available, As a leading supplier in China, our factory produces high-quality expansion anchors that meet international standards. Trust JGD for reliable anchoring solutions that combine strength, design, and performance
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
    Contact us
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws02
    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
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws03
    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.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws04
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws05
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws06

    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.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws08
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws07
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws03

    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 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.

    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

    Factory View 1
    Factory View 2
    Factory View 3
    Factory View 4
    Factory View 5

    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    What unique manufacturing technologies are used for these screws?
    We utilize Multi-Station Cold Heading Technology, Micron-Level Thread Rolling, and an Intelligent Heat Treatment System to ensure high precision and durability.
    How do the fish-scale barbs improve performance in hollow bricks?
    The sharp fish-scale bidirectional barbs spiral along the surface and embed into the wall, preventing rotation and offering significantly higher holding power compared to smooth sleeves.
    Are the screws suitable for outdoor use?
    Yes, our carbon steel screws feature dual corrosion protection with blue-white or yellow zinc plating, making them resistant to moisture and mild corrosion for both indoor and outdoor applications.
    What customization options are available for bulk orders?
    We offer flexible customization for head and slot shapes, special materials, extra large/long specifications, surface treatment colors, and personalized packaging or labeling.
    How do you ensure the quality of the raw materials?
    We implement Raw Material Source Locking and Furnace Number Batch Full Traceability, supported by third-party material certifications and real-time salt spray test monitoring.
    What kind of technical support do you offer?
    Our technical services include on-site failure analysis, BOM optimization, installation tool guidance, free sample testing, and Inventory Management (VMI) trusteeship.