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China Suppliers Factory Black Zinc Oxide CSK Flat Head Hexagonal Bolt Screw - High Quality Carbon & Alloy Steel
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China Suppliers Factory Black Zinc Oxide CSK Flat Head Hexagonal Bolt Screw - High Quality Carbon & Alloy Steel

Introducing our high-quality fasteners, sourced directly from our reputable factory in China. Our products are available at a competitive FOB price ranging from US $0.4 to $9.99 per piece, with a minimum order quantity of just 100 pieces. We are proud to offer a robust supply ability of 10,000 pieces per month, ensuring that we can meet your demands efficiently.

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Our fasteners undergo a reliable black oxide surface treatment and are manufactured from premium materials such as carbon steel, alloy steel, and stainless steel. We adhere to various standards including DIN, GB, UNC, BSW, and JIS, guaranteeing the quality and compatibility of our products.

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As trusted suppliers, we hold several certifications, including ISO9001, ISO14001, ISO45001, and SGS, reflecting our commitment to quality management and environmental responsibility. Our products are available in various grades, including 4.8, 8.8, 10.9, 12.9, A2-70, A4-70, and A4-80, catering to a wide range of applications.

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Choose our factory in China for reliable and high-performance fasteners that meet your specific needs!

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    Product Detail

    Structure and Characteristics
    🔩 Head Design — Flat Head

    The top surface of the head is flat and can be aligned with the surface of the workpiece after installation, reducing protrusions and suitable for occasions that require a flat or streamlined appearance.

    📐 Head Design — Conical Bottom

    The bottom surface of the head is usually conical and can be embedded into the pre-made conical counterbore of the workpiece to provide better fit.

    🔧 Hexagonal Drive

    The hexagonal groove in the center of the head (ISO 4762 standard) can fully fit with the internal hexagonal wrench, transmitting large torque and reducing the risk of slipping.

    📏 Threaded Section

    The thread types are mostly metric coarse teeth (such as M4, M6) or fine teeth (such as M8 × 1.25), and the length and diameter can be customized according to needs.

    Main Application Scenarios
    • Mechanical Manufacturing: Used for the assembly of precision equipment (such as machine tools and molds), in areas that require high loads and limited space.
    • Automotive Industry: Requires highly reliable connections for engine components, transmissions, chassis, and other components.
    • Electronic Products: The structural fixation of compact devices such as laptops and mobile phones.
    • Aerospace: Connection points with high requirements for weight and strength in lightweight design.
    Core Advantages
    💪 High Torque Transmission

    The contact area between the hexagonal hole and the wrench is large, which can withstand greater tightening torque.

    📦 Space Saving

    The flat head design does not occupy external space, making it suitable for small or aesthetically pleasing installation environments.

    🔒 Anti-Loosening Performance

    When used in conjunction with spring washers or thread glue, it can effectively prevent loosening caused by vibration.

    ✨ Aesthetics

    After installation, the surface is flat without exposed bolt heads, suitable for products with high appearance requirements.

    Specifications and Standards
    Category Details
    Material Carbon steel (surface galvanized, blackened treatment), stainless steel (such as 304/316, corrosion-resistant), titanium alloy (lightweight and high-strength scenario).
    Size Standard Metric (ISO 4762), American (ANSI/ASME B18.3), with a common diameter range of M2 to M24.
    Surface Treatment Galvanized (rust proof), Dacromet (high-temperature corrosion resistance), electrophoretic (decorative coating), etc.
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    Frequently Asked Questions (FAQ)
    Q What is a flat head socket cap screw and how does it differ from a regular socket cap screw?
    A flat head socket cap screw features a countersunk, flat-top head with a conical underside, allowing it to sit flush with or below the workpiece surface. Unlike a standard socket cap screw (which has a cylindrical raised head), the flat head design is ideal for applications where surface protrusions must be minimized.
    Q What materials are flat head socket cap screws available in?
    They are commonly available in carbon steel (with galvanized or blackened surface treatment), stainless steel grades 304 and 316 for corrosion resistance, and titanium alloy for lightweight, high-strength applications in aerospace and motorsport industries.
    Q What size range is available for flat head socket cap screws?
    Flat head socket cap screws are typically available in metric sizes ranging from M2 to M24, conforming to standards such as ISO 4762 (metric) and ANSI/ASME B18.3 (American). Custom lengths and diameters can also be manufactured upon request.
    Q How do I prevent flat head socket cap screws from loosening under vibration?
    To prevent loosening caused by vibration, flat head socket cap screws can be used in combination with spring washers, lock washers, or thread-locking adhesives (such as Loctite). Proper torque application during installation is also critical for maintaining a secure connection.
    Q What surface treatments are available and what are their benefits?
    Common surface treatments include galvanizing (provides rust and corrosion protection), Dacromet coating (excellent resistance to high-temperature corrosion), and electrophoretic coating (decorative finish with additional protection). The choice depends on the operating environment and aesthetic requirements.
    Q In which industries are flat head socket cap screws most commonly used?
    Flat head socket cap screws are widely used across mechanical manufacturing (machine tools, molds), the automotive industry (engine components, transmissions, chassis), consumer electronics (laptops, mobile phones), and aerospace engineering where lightweight, high-strength, and flush-surface connections are required.