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304 Stainless Steel Countersunk Expansion Anchors - China Suppliers and Factory for Hidden Flush Wall Bolts

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Product 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: Available in M6, M8, M10, M12 with lengths ranging from 30mm to 100mm; customizable options available.
Surface Treatment: Stainless Steel features a mirror polished and passivated finish, ensuring acid and alkali resistance, as well as moisture-proof and rust-proof properties. Carbon Steel is treated with yellow zinc plating to enhance outdoor rust resistance.
Design Features: Our countersunk anchor showcases a flat head design that remains flush with surfaces, a cross-groove drive for high compatibility, and a top ring-shaped anti-slip knurled texture. The uniform internal expansion of side seams and all stainless steel construction ensure excellent weather resistance and corrosion resistance.
Applications: Ideal for installation in furniture and bathroom hardware, fixing appliances and baseboards, supporting door and window subframes, and securing indoor light to medium load-bearing fixtures. Suitable for advertising signage and signboard installations.
Delivery Time: 15-30 days after advance payment is received.
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces; negotiable
Samples: Available upon request.
Packaging: Offered in boxed, bulk, pallet, or customized packaging options.
OEM Services: Available.
As a leading supplier and factory based in China, we ensure high-quality production standards for all our countersunk cross recessed sleeve anchors.

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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

    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
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    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
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    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
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    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 + 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.

    Anti-Slip Knurling
    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

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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 provides exceptional corrosion resistance and a high-quality aesthetic finish. Its chromium oxide protective layer ensures durability against moisture and common cleaning agents.
    Does the countersunk head design offer any functional advantages?
    Yes, the countersunk flat-head allows the screw to sit flush with the surface, preventing snags, reducing wear, and providing a clean, professional appearance.
    Can these screws handle vibrations without loosening?
    Absolutely. The uniform internal expansion structure and anti-slip knurling provide 360° grip and high friction, ensuring excellent anti-loosening performance even under mild vibration.
    What kind of customization do you offer for large orders?
    We offer flexible customization including specific head/slot shapes, extra-long specifications, special surface treatment colors, and personalized packaging or labeling.
    How do you ensure the quality of every batch?
    Our quality control system includes full traceability via furnace numbers, third-party certification, real-time salt spray monitoring, and fully automatic optical sorting.