Basic introduction to carriage bolts

Carriage bolt refers to round head square neck screw, English is carriage bolt

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 cannot connect. A wrench is generally used as a tool. The heads are mostly hexagonal heads, etc., generally larger. The carriage bolt is applied in the groove, and the square neck is stuck in the groove during installation, which can prevent the bolt from rotating, and the carriage bolt can move in parallel in the groove. Since the heads of the carriage bolts are round, there is no design of useful power tools such as cross grooves or inner hexagons, and they can also play a role in preventing theft in the actual connection process.

material:Carbon steel, Q235, 45# steel, stainless steel

Nominal diameter: 5mm--20mm

Length: 15mm--300mm

Surface treatment method: zinc plating, chrome 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 large round head square neck carriage bolts: national standard GB/T14-8