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China Suppliers Factory Black Zinc Oxide CSK Flat Head Hexagonal Bolt Screw - Carbon Steel, Alloy Steel, Stainless Steel
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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.
Conical Bottom Surface: 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.
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Main Application Scenarios
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Mechanical Manufacturing Used for the assembly of precision equipment (such as machine tools and molds), in areas that require high loads and limited space.
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Automotive Industry Requires highly reliable connections for engine components, transmissions, chassis, and other components.
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Electronic Products The structural fixation of compact devices such as laptops and mobile phones.
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Aerospace Connection points with high requirements for weight and strength in lightweight design.
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Core Advantages
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High Torque Transmission
The contact area between the hexagonal hole and the wrench is large, which can withstand greater tightening torque.
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Space Saving
The flat head design does not occupy external space, making it suitable for small or aesthetically pleasing installation environments.
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Anti-Loosening Performance
When used in conjunction with spring washers or thread glue, it can effectively prevent loosening caused by vibration.
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Aesthetics
After installation, the surface is flat without exposed bolt heads, suitable for products with high appearance requirements.
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Specifications and Standards
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
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What is the difference between a flat head socket cap screw and a regular socket cap screw?
A flat head socket cap screw features a countersunk head with a flat top surface that sits flush with the workpiece after installation, while a regular socket cap screw has a raised cylindrical head that protrudes above the surface. The flat head design is preferred in applications requiring a smooth, streamlined appearance or where protruding heads would interfere with adjacent parts.
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What materials are flat head socket cap screws commonly made from?
Flat head socket cap screws are commonly manufactured from carbon steel (often with galvanized or blackened surface treatment), stainless steel grades such as 304 and 316 for corrosion resistance, and titanium alloy for lightweight, high-strength applications such as aerospace and motorsport.
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What size range is available for flat head socket cap screws?
Flat head socket cap screws are available in a wide range of sizes. Common metric diameters range from M2 to M24, following ISO 4762 standards. American standard sizes follow ANSI/ASME B18.3. Both coarse thread (e.g., M4, M6) and fine thread (e.g., M8 × 1.25) options are available, with custom lengths and diameters possible upon request.
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How can I prevent flat head socket cap screws from loosening under vibration?
To prevent loosening under vibration, flat head socket cap screws can be used in combination with spring washers, lock washers, or thread-locking adhesives (such as threadlocker compounds). Proper torque application during installation is also essential to ensure a secure and reliable connection.
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What surface treatments are available and what are their benefits?
Common surface treatments include galvanizing for rust and corrosion protection, Dacromet coating for high-temperature corrosion resistance, and electrophoretic coating for decorative and protective purposes. The choice of surface treatment depends on the operating environment, temperature conditions, and aesthetic requirements of the application.
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In which industries are flat head socket cap screws most commonly used?
Flat head socket cap screws are widely used across multiple industries including mechanical manufacturing (machine tools, molds, precision equipment), the automotive industry (engine components, transmissions, chassis), consumer electronics (laptops, mobile phones), and aerospace engineering where lightweight design combined with high strength and reliability is critical.