China HDG Carriage Bolt products, a type of fastener consisting of a head and a screw (a cylinder with external threads), need to be matched with a nut to fasten two parts with through holes. The China HDG Carriage Bolt products refer to a roundhead square neck screw, but some people call it differently. The difference between it and ordinary screws is that there is a square step at the connection between the head and the screw, which is also called a stop screw.

China HDG Carriage Bolt products are mainly used on machinery, and they are placed in a grooved threaded hole for connection. The square neck of the screw will be stuck in the groove, preventing the China HDG Carriage Bolt products from rotating in the same direction during installation. The bolt itself can move parallel within the slot.
Since the heads of China HDG Carriage Bolt products are round, there is no cross-recessed or hexagonal design for available power tools, which can also play a role in preventing theft during the actual connection process. The application range of China HDG Carriage Bolt products is not very wide, mainly used in special equipment.