CSK head self drilling screws (countersunk head self drilling screws) feature a conical head design that sits flush with the fastened material surface after installation, creating a smooth, seamless finish. This design eliminates the risk of scratches caused by protruding screw heads while enhancing overall product aesthetics, making it ideal for applications requiring high surface flatness such as precision instrument enclosures and high-end furniture decoration.
Our csk self drilling screws are widely used in metal roofing, furniture assembly, and industrial equipment.
We offer a complete range of sizes for countersunk head self drilling screws, covering key parameters including thread size, diameter and length, meeting fastening requirements for different material thicknesses. Custom sizes are available to solve the industry pain point of mismatched dimensions.
For csk head self drilling screws, the standard specifications are as follows:
| Thread Size | Diameter | Length Range | Head Angle | Suitable Material Thickness |
|---|---|---|---|---|
| ST2.2 | 2.2mm | 6mm-20mm | 80-90° | 0.3mm-1.0mm (Metal); 3mm-10mm (Wood) |
| ST3.5 | 3.5mm | 10mm-50mm | 80-90° | 0.5mm-2.0mm (Metal); 5mm-20mm (Wood) |
| ST4.2 | 4.2mm | 16mm-80mm | 80-90° | 0.7mm-2.5mm (Metal); 8mm-30mm (Wood) |
| ST4.8 | 4.8mm | 20mm-100mm | 80-90° | 1.0mm-3.0mm (Metal); 10mm-40mm (Wood) |
| ST5.5 | 5.5mm | 30mm-120mm | 80-90° | 1.5mm-4.0mm (Metal); 15mm-50mm (Wood) |
| ST6.3 | 6.3mm | 40mm-150mm | 80-90° | 2.0mm-5.0mm (Metal); 20mm-60mm (Wood) |
Standard sizes come with full thread as standard; half-thread, fine thread or coarse thread can be customized upon request.
The default head angle is 80-90°, suitable for countersunk fitting with different materials.
Our CSK head self drilling screws are manufactured via precision cold heading process for consistent head profile and tight countersunk tolerance.
The drill point is precision-machined from hardened steel (case-hardened carbon steel) to deliver maximum piercing performance, enabling direct penetration into metal sheets and wooden substrates without pre-drilling.
Threads are cold-rolled to provide uniform pitch, enhanced pull-out resistance and reduced risk of thread stripping.
Full-process quality control is enforced from raw material incoming inspection to finished product packaging, with 100% sampling on key dimensions and mechanical properties.
Hefeng Group focuses on manufacturing and supplying screws for real construction needs.
Over the past 10 years, we’ve worked with customers across North America, South America, and Southeast Asia, learning that consistency matters most in this business...[ Read More >>]
