Nut, a mechanical basic part, is known as the' rice of industry', ranging from space shuttles, automobiles and mechanical equipment to tables, chairs and benches. This industry is a labor-intensive, capital-intensive and high-tech strategic industry, and all countries in the world attach great importance to its development. After years of development, China has developed into the largest fastener producer in the world. It is reported that there are nearly 10,000 fastener manufacturing and trading enterprises in China, with more than 1 million employees, which make a high contribution to employment. Domestic carbon steel fasteners are mainly used in automobile industry, electronic products, electronic equipment, mechanical equipment, construction and general industrial purposes. As far as the national producing areas are concerned, the fastener industry in Wenzhou, Yongnian and Haiyan is the largest and most distinctive.
