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304 Stainless Steel Countersunk Expansion Anchors - China Supplier & Factory for Hidden Flush Sleeve Wall Bolts

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Name: Countersunk Cross Recessed Sleeve Anchor
Material: Crafted from premium AISI 304 Stainless Steel and durable Q235 Carbon Steel
Standards: Conforms to ETAG 001 and GB/T 22795 regulations
Grade: Available in Stainless Steel: A2-70 and Carbon Steel: Grade 4.8 / Grade 8.8
Specifications: Offered in sizes M6, M8, M10, M12 with adjustable lengths from 30mm to 100mm, customizable upon request
Surface Treatment: Stainless Steel features a mirror polished finish and passivation for enhanced acid, alkali, moisture, and rust resistance; Carbon Steel is treated with yellow zinc plating to boost outdoor rust resistance
Design Features: Engineered with a flat and countersunk head to remain flush with surfaces; cross-groove drive for superior compatibility; top ring-shaped anti-slip knurled texture; uniform internal expansion with side seams; all stainless steel construction ensures weather and corrosion resistance
Applications: Ideal for installations in furniture, bathroom hardware, appliance and baseboard fixing, door and window subframes, indoor light and medium load-bearing hanging parts, as well as advertising signage and signboard setups
Delivery Time: 15-30 days after advance payment confirmation
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable for larger or specific orders
Samples: Available upon request
Packaging: Offered in boxed, bulk, or pallet formats, with options for customized packaging
OEM: Available from our factory for tailored solutions

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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.
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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
    Multi Station Cold Heading Technology
    Intelligent Heat Treatment System
    Micron-Level Thread Rolling Process
    Fully Automatic Optical Sorting
    Environmentally Friendly Surface Treatment
    Metallographic & Mechanical Lab
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    Quality Control System
    Raw Material Source Locking
    Full Batch Traceability
    Third Party Material Certification
    Transparent Process Parameters
    Real-Time Salt Spray Monitoring
    International Standard Compliance
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    Flexible Customization
    Customizable Head/Slot Shapes
    Special Materials Application
    Extra Large/Long Specifications
    Integrated Component Assembly
    Custom Surface Treatment Colors
    Personalized Packaging & Labeling
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    Technical Service
    On-Site Failure Analysis
    BOM Optimization & Calculation
    Installation Tool Guidance
    Inventory Management (VMI)
    Free Sample Making & Testing
    Standard Translation & Interpretation
    304 Stainless Steel
    304 Stainless Steel – Aesthetic & Corrosion-Resistant
    Made of AISI 304 stainless steel (A2-70), mirror-polished and passivated for a bright, smooth surface with a dense chromium oxide protective layer – resisting moisture, acids, alkalis, and daily cleaning agents. The countersunk flat-head design allows the head to fully embed into the workpiece surface, sitting flush with furniture, bathroom hardware, or window frames – eliminating rust risks while delivering a refined, concealed installation finish.
    Anti-Slip Knurling
    Anti-Slip Knurling + Uniform Internal Expansion
    The top annular anti-slip knurling provides extra friction during Phillips screwdriver tightening, preventing cam-out and ensuring accurate torque transmission. The uniform internal expansion structure ensures the sleeve expands evenly along longitudinal slots, gripping the hole wall 360° with balanced stress distribution, avoiding localized over-expansion that could crack the substrate. High tensile strength (A2-70 ≥700MPa) delivers excellent anti-loosening performance.
    Concealed Installation
    Concealed Countersunk Installation – Wear-Resistant & Long-Lasting
    The flat countersunk head not only looks clean but also prevents protrusion that could lead to impact wear. The 304 stainless steel substrate offers high hardness, and the mirror-polished surface is smooth and wear-resistant – resisting galling or scratching during repeated assembly/disassembly. Proven in durability tests, this anchor performs reliably in indoor window auxiliary fixing, appliance baseboards, or sign installations.
    Factory Environment & Product Display
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    High-Quality Stainless Steel Self-Tapping Screw Display
    Frequently Asked Questions
    What is the advantage of 304 stainless steel?
    It offers superior corrosion resistance due to its chromium-nickel composition, making it ideal for moisture-rich environments like bathrooms and kitchens.
    Can I customize the screw head shape?
    Yes, we offer flexible customization for various head and slot shapes to meet specific application and aesthetic requirements.
    How does the expansion sleeve work?
    As the screw is driven in, the sleeve expands evenly along longitudinal slots, providing a 360° grip against the hole wall for secure fixing.
    Are these screws suitable for outdoor use?
    While 304 is excellent for indoor and mild outdoor use, we recommend passivated 304 or 316 grade for highly corrosive coastal environments.
    Do you provide technical support for selection?
    Yes, we provide selection calculations, BOM optimization, and on-site failure analysis to ensure you choose the right fastener for your project.
    What quality certifications do you follow?
    Our products comply with international standards and undergo rigorous testing, including salt spray monitoring and metallographic analysis.