Functional convex round nuts are ubiquitous in our daily lives, which certainly indicates their close connection to our lives and reflects their importance. Therefore, the requirements for functional convex round nuts are of extra significance. There are four main materials for functional convex round nuts: carbon steel, stainless steel, copper, and alloy. Carbon steel nuts are quite common and widely used, featuring a black color and overall hardness. Stainless steel nuts are often used in electronics, shipbuilding, and automotive industries due to their resistance to rust, making their applications rather upscale. Copper nuts are commonly used in fields requiring explosion-proof conditions, such as coal mines and power plants. Alloy steel nuts, known for their exceptional hardness and durability, are extensively used in railway transportation, mining equipment, and oil drilling.