Black Zinc Oxide CSK Flat Head Hexagonal Bolt Screw - China Suppliers & Factory Direct Price
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.
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.
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.
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.
Used for the assembly of precision equipment (such as machine tools and molds), in areas that require high loads and limited space.
Requires highly reliable connections for engine components, transmissions, chassis, and other components.
The structural fixation of compact devices such as laptops and mobile phones.
Connection points with high requirements for weight and strength in lightweight design.
The contact area between the hexagonal hole and the wrench is large, which can withstand greater tightening torque.
The flat head design does not occupy external space, making it suitable for small or aesthetically pleasing installation environments.
When used in conjunction with spring washers or thread glue, it can effectively prevent loosening caused by vibration.
After installation, the surface is flat without exposed bolt heads, suitable for products with high appearance requirements.
Carbon steel (surface galvanized, blackened treatment), stainless steel (such as 304/316, corrosion-resistant), titanium alloy (lightweight and high-strength scenario).
Metric (ISO 4762), American (ANSI/ASME B18.3), with a common diameter range of M2 to M24.
Galvanized (rust proof), Dacromet (high-temperature corrosion resistance), electrophoretic (decorative coating), etc.
What are the main advantages of the flat head design?
The flat head design does not occupy external space and can be aligned with the workpiece surface after installation. It is ideal for small or aesthetically pleasing environments, reducing protrusions.
How does the hexagonal drive improve performance?
The hexagonal groove in the center of the head (ISO 4762 standard) fully fits with the internal hexagonal wrench, allowing for large torque transmission and significantly reducing the risk of slipping.
In which industries are these fasteners commonly used?
They are widely used in mechanical manufacturing, the automotive industry, electronic products, and aerospace applications due to their high reliability, strength, and space-saving features.
How can I prevent the screws from loosening?
When used in conjunction with spring washers or thread glue, they can effectively prevent loosening caused by vibration, ensuring a highly reliable connection.
What materials and surface treatments are available?
Common materials include carbon steel, stainless steel, and titanium alloy. Surface treatments range from galvanized (rust proof) and Dacromet (high-temperature corrosion resistance) to electrophoretic decorative coatings.