Generally speaking, bolts are used to connect two objects, usually through light holes, and need to be used in conjunction with nuts, and a single bolt cannot be used for connection. Tools generally use wrenches. The heads are mostly hexagonal and generally larger. The carriage bolt is used in the groove, and the square neck is stuck in the groove during installation, which can prevent the bolt from rotating, and the Carriage Bolt can move in parallel in the groove. Since the head of the carriage bolt is round, there is no design of available power tools such as cross grooves or hexagon sockets, which can also play a role in preventing theft in the actual connection process.

Zheshang Development Group (ZheJiang) New Material Technology Co., Ltd. is an enterprise engaged in the production, sales and service of M6-M27 national standard carriage bolts (semi-round head and square neck bolts), plow wire, bridge wire and other products. Our company is located in JiaXing, the distribution center of China's standard parts manufacturing and sales. The company has strong technical force, production equipment, exquisite craftsmanship, perfect testing methods, and modern management. Founded in 2017, the factory is an early-established special-shaped fastener manufacturing enterprise in North China. The factory has many years of production experience, qualified production equipment, high-quality products, complete varieties, and the annual output of the industry ranks first in the industry. Dachang steel, using high-frequency induction heating, the warm upsetting process has been well received by the majority of users and textile mills. Some products are exported all year round, and various special-shaped parts and British, American, German, and bolts are customized.