Round nuts are a common fastener widely used in machinery and equipment. Common types include round nuts, knurled round nuts and insert nuts. The thread specifications of round nuts range from M10×1 to M200×3, covering a variety of sizes. Common materials include carbon steel and stainless steel, and different materials are suitable for different environments and requirements. There are various surface treatment methods, such as oxidation treatment, chrome plating, zinc plating, etc., to improve corrosion resistance and aesthetics.