As a basic fastener, screws are widely used in daily life and various industrial fields. Their function is to connect two workpieces together and play a fastening role. There are many types of screws, including machine screws, self-tapping screws, woodworking screws, cement wall screws and self-drilling screws, etc. Each screw has its specific use and characteristics. In terms of material selection, screws are usually made of carbon steel or stainless steel to ensure their durability and corrosion resistance.

The type of screws and their characteristics are also important factors to consider when selecting and using screws. Machine screws are suitable for the connection of precision mechanical equipment, while self-tapping screws can be directly screwed into the material without pre-drilling, which improves construction efficiency. Woodworking screws are designed for wood materials and have a thread design that is easier to grip, while cement wall screws and self-drilling screws are suitable for the connection and fixation of harder materials such as cement walls and metal materials, respectively.