How do you know if screws are self-tapping?

Self-tapping screws have threads that are specifically designed to cut their own threads into materials such as metal or plastic, which allows them to be used without the need for pre-drilling a pilot hole. There are a few key features that you can look for to identify self-tapping screws:

• Self-tapping screws have a sharp point, which is used to puncture the material and start the thread-cutting process.
• They also have a thread pattern that extends down the entire length of the screw, rather than just a portion of it. This allows the screw to tap its own threads as it is being driven into the material.
• The thread pattern on self-tapping screws is typically more aggressive than on regular screws, with deeper and more widely spaced threads. This helps the screw to cut through the material more effectively.
• Self-tapping screws may also have a specially-shaped head, such as a hex head or Phillips head, that is designed to allow for better grip and torque when driving the screw.

In general, if you are unsure whether a screw is self-tapping, it is best to consult the manufacturer's documentation or specifications to confirm.