Screws are the most commonly used fasteners in manufacturing and construction. They are often used with clips to secure keels or side covers, providing a reliable connection. They can be categorized by material: iron screws and stainless steel screws. Iron screws are low-cost, and their strength can be increased through heat treatment, but they offer poor corrosion resistance. Stainless steel screws are rust-resistant and weather-resistant, making them suitable for humid or corrosive environments, but they are relatively expensive. There are various types of screws, including machine screws, self-tapping screws, expansion screws, and wood screws, each suitable for different substrates such as metal, wood, and concrete. The material and type should be selected based on the operating environment, load requirements, and ease of installation to ensure a stable, durable, and economical structure.