Carriage bolts refer to round head square neck screws. Carriage screws can be divided into large semi-round head carriage screws and small semi-round head carriage screws according to the size of the head.
    The carriage bolt is a fastener consisting of the head and the screw. It needs to cooperate with the nut to connect two parts with through holes to play a fastening role.
Generally, bolts connect two materials through light holes, and they need to be used in conjunction with nuts. A single bolt part cannot be used for connection. The head is mostly hexagonal, and the individual is generally larger. The carriage bolt is used in the groove, and the square neck is stuck in the groove during the installation process, which prevents the bolt from rotating and can move in parallel in the groove. The head of the carriage bolt is round, which plays an anti-theft role in the actual connection work.