Carriage bolts refer to round head square neck screws, which are called carriage in English. Generally speaking, bolts are used to connect two objects, usually through light holes, and need to be used in conjunction with nuts (nuts). They cannot connect alone. Tools generally use wrenches. The heads are mostly hexagonal and generally larger. The carriage bolt is applied in the groove. The square neck is stuck in the groove during the installation process, which can prevent the bolt from rotating. The carriage bolt can move parallel in the groove. Since the head of the carriage bolt is round and there are no power-assisting tools such as cross recess or inner hexagon, it can also play an anti-theft role during the actual connection process.
Materials are divided into: carbon steel, Q235, 45# steel, stainless steel
Nominal diameter: 5mm--20mm
Length:15mm--300mm
Surface treatment method: zinc plating, chromium plating, copper plating, surface blackening
Product Standards:
Specification for stainless steel round head square neck bolts (carriage bolts): German standard DIN603
Specification for stainless steel small round head square neck carriage bolts: National standard GB/T12-85
Specification for stainless steel large round head square neck carriage bolts: National standard GB/T14-8
Product Usage:
Carriage bolts are generally used for marble installation of dry hanging parts. When tightened, the bolt rod will not rotate due to the square neck, which is convenient for fixing and installation. It is mainly used in places that require countersunk head screws.
