What is the main characteristic of a "self-tapping" screw?

A self-tapping screw is specifically designed to create its own hole as it is driven into a material, which is the fundamental characteristic that distinguishes it from other types of screws. This means that the screw's threads are designed to cut into the material, allowing it to form a tight grip without the need for a pre-drilled hole. This feature makes self-tapping screws extremely useful in various applications, significantly simplifying installation processes, especially in materials like wood or plastic where drilling might not be practical or necessary.

The ability to tap its own hole enhances efficiency and saves time during assembly, making these screws popular in both manufacturing and DIY contexts. Self-tapping screws can be used with a variety of materials, not limited just to metals, and they do not require a separate drill, as their design incorporates this functionality directly into their structure. Additionally, their head size can vary depending on the specific design and application.