According to the size of the head screws carriage is divided into half round carriage screws (corresponding to standard GB/T14 and DIN693), half round carriage bolts (standard GB/T12-85)., and
Carriage bolt, a type of fastener that is composed of two parts of the head and the screw (with an outer screw cylinder)., need to cooperate with the nut, used for fastening two parts with through hole,

But generally speaking, the bolt is used to connect two objects, usually through hole, need and nut (nut) with the use of individual connection. General tool wrench. Head more than six angle class, general. The carriage bolt is applied in the groove., four square neck is stuck in the slot in the process of installation., can prevent the bolt rotation, the carriage bolt can move in parallel in the head of the groove.. Of the carriage bolt is round, the design of usable power tools without cross slot or internal six corners. In the actual connection process can also play an anti-theft role. And the
Carbon steel stainless, steel Q235, Material:, 45#
Diameter: 5mm--20mm Nominal
15mm--300mm Length:
Treatment: galvanized Copper, Chrome, plating Black, surface Surface,

Steel round head square neck bolts specification: (bolts carriage) DIN603 standard Stainless
Steel round head square neck bolts standard: GB GB/T12-85 Stainless
Steel truss head square neck bolts specification: GB/T14-8 GB Stainless