Thread Size: 1/4-20 x 5"; Square Neck Width: 6.4mm / 0.25". Made of carbon steel with zinc plated finish. Each carriage bolt is equipped with a flat washer and a nut.. The carriage bolt is designed with a round head and a square neck. It is used in the groove. The square neck is conveniently stuck in the groove during the installation process and can prevent the bolt from rotating during installation.. Due to the head of the carriage bolt, there is no groove type that can be used with a power assisting tool such as a cross recess or a hex socket. It can also be hidden during actual use to prevent disassembly.. It is widely used in mechanical equipment, bridge construction, and other industries..
