Carriage screw：

Carriage bolts are divided into semi-round-headed carriage bolts (corresponding to standard GB/T14 and DIN603) and small semi-round-headed carriage bolts (corresponding to standard GB/T12-85) according to the size of the head.Carriage bolts, a class of fasteners composed of two parts: a head and a screw (a cylinder with an external thread), need to be matched with a nut to fasten and connect two parts with through holes.

Carriage screw definition：

Carriage bolt refers to a round-headed square-neck screw, which is carriage bolt in English.

Basic information：

Generally speaking, bolts are used to connect two objects, usually through light holes, and need to be used in conjunction with nuts (nuts). A single one does not work as a connection.Tools generally use a wrench.The heads are mostly hexagonal heads, which are generally larger. Carriage bolts are used in the groove, and the square neck is stuck in the groove during the installation process, which can prevent the bolt from rotating, and the carriage bolts can move in parallel in the groove.Since the head of the carriage bolt is round, there is no design of available booster tools such as cross groove or hexagon socket, which can also play an anti-theft role in the actual connection process.

Material: carbon steel, Q235, 45# steel, stainless steel

Nominal diameter: 5mm--20mm

Length: 15mm--300mm

Surface treatment method: galvanized, chrome-plated, copper-plated, surface blackening

Standard：

Round head square neck bolt (carriage bolt) specification: German standard DIN603, British system, American system

Small round head square neck carriage bolt specification: National standard GB/T12-85

Large round head square neck carriage bolt specification: National standard GB/T14-8