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304 Stainless Steel Cross Countersunk Internal Expansion Anchors from China Suppliers Factory – Durable Hidden Flush Sleeve Wall Bolts

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Name: Countersunk Cross Recessed Sleeve Anchor
Material: AISI 304 Stainless Steel, Q235 Carbon Steel
Standards: ETAG 001, GB/T 22795
Grade: Stainless Steel: A2-70, Carbon Steel: Grade 4.8 / Grade 8.8
Specifications: M6, M8, M10, M12 (Length 30mm - 100mm) Customizable
Surface Treatment: Stainless Steel: Mirror polished and passivated, offering acid and alkali resistance, moisture-proof and rust-proof; Carbon Steel: Yellow zinc plating for enhanced outdoor rust resistance
Design Features: With a flat and countersunk head design, these anchors do not protrude from the surface, ensuring a smooth finish. The cross-groove drive provides high compatibility, while the top ring-shaped anti-slip knurled texture ensures reliable grip. The uniform internal expansion of side seams enhances stability, and the all-stainless steel construction offers exceptional weather and corrosion resistance.
Applications: Ideal for furniture and bathroom hardware installations, appliance and baseboard fixing, supporting door and window subframes, and auxiliary fixing. Suitable for indoor light to medium load-bearing hanging parts, as well as advertising signage and signboard installations.
Delivery Time: 15-30 days after receiving advance payment
Origin: China, manufactured by trusted Suppliers and Factory
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable
Samples: Available upon request
Packaging: Available in Boxed/Bulk/Pallet or customized packaging options
OEM: Available for customized orders

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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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    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

    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
    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, ideal for interior applications with high aesthetic demands.

    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 – as the screw is driven in, 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. Combined with high tensile strength (A2-70 ≥700MPa), it delivers excellent anti-loosening performance in furniture brackets and sign fixings.

    Concealed Countersunk 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 – withstanding daily cleaning, humidity changes, and mild vibration without loosening or rusting. Extremely long replacement cycles – one installation, years of peace of mind.

    Factory Environment & Product Display

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions (FAQ)

    What are the primary benefits of using 304 stainless steel for these screws?
    304 stainless steel (A2-70) provides excellent corrosion resistance against moisture and common cleaning agents. It also offers high tensile strength and a mirror-polished finish suitable for high-end aesthetic applications.
    Can the screw head shapes be customized for specific projects?
    Yes, we offer flexible customization capabilities, including customizable head and slot shapes, as well as special materials and extra-long specifications to meet unique engineering requirements.
    How does the internal expansion structure improve stability?
    The sleeve expands evenly 360° along longitudinal slots as the screw is driven in. This ensures balanced stress distribution against the hole wall, preventing substrate cracking and enhancing anti-loosening performance.
    Is the manufacturing process traceable?
    Absolutely. We implement a quality control system that includes raw material source locking and full furnace number batch traceability to ensure every product meets international standards.
    What kind of technical support do you provide for new installations?
    We provide on-site failure analysis, selection calculations, BOM optimization, and guidance on choosing the right installation tools, along with free sample making and testing.
    Are these screws suitable for high-vibration environments?
    Yes, the combination of anti-slip knurling and high tensile strength (≥700MPa) allows these anchors to perform reliably even in environments subject to mild vibration and humidity changes.