Final answer:
The most common fastener used to connect CFS to CFS is screws.
Step-by-step explanation:
The most common fastener used to connect Cold-Formed Steel (CFS) to CFS is screws.
Screws provide a secure and reliable connection between CFS members. They have threads that grip the material and create a strong bond. The threads of the screw engage with the CFS, preventing any movement or separation.
One type of screw commonly used in CFS construction is a self-drilling screw. These screws have a drill-like point that can pierce through the CFS without the need for pre-drilling, making installation faster and more efficient.