Round head square neck screw
Carriage bolts are divided into large half round head carriage bolts (corresponding to standards GB/T14 and DIN603) and small half round head carriage bolts (corresponding to standards GB/T12-85) based on their head size. A carriage bolt is a type of fastener consisting of a head and a screw (a cylindrical body with external threads), which needs to be matched with a nut to securely connect two parts with through holes.
Generally speaking, a bolt is used to connect two objects, usually through a light hole, and needs to be used in conjunction with a nut. A single bolt does not serve as a connection. Tools usually use a wrench. The head is mostly hexagonal and generally larger. Carriage bolts are used in grooves, and the square neck is stuck in the groove during installation to prevent the bolt from rotating. Carriage bolts can move in parallel within the groove. Due to the circular shape of the head of the carriage bolt, there is no design of a cross groove or hexagonal socket that can be used as a power tool, which can also play a role in preventing theft during the actual connection process.
Carriage bolts are a form of bolt used to secure metal to metal or metal wood.
It differs from other bolts in that its shallow mushroom head and handle have a cross-sectional area, although most of its length is circular (like other types of bolts), it is square directly below the head. This causes the bolt to self lock when passing through the square hole on the metal strip. This allows for the installation of fasteners from one side using only one tool (wrench or wrench). The head of a carriage bolt is usually a shallow dome. The tool handle has no thread; Its diameter is equal to the edge of a square cross-section.
The carriage bolts are designed to be used through iron reinforcement plates on both sides of the wooden beam, and the square part of the bolts is installed in the square holes of the iron products. Usually, carriage bolts are used to expose wood, with a square section providing sufficient grip to prevent rotation.
Materials: 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
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 carriage bolts with large round head and square neck: national standard GB/T14-8
