DIN 603 Cup Head Square Neck Bolts

DIN 603 Cup Head Square Neck Bolts，also known as Carriage Bolts, Coach Bolts or Coach Screws, are metric cup head square neck bolts with a smooth, rounded head and a square section beneath the head.

The square neck engages with the mating material to help prevent the bolt from turning during nut tightening, making this design useful where access to the bolt head is limited or a smooth exposed head is preferred.

DIN 603 specifies cup head square neck bolts with metric threads from M5 to M20 in product grade C. The standard defines the dimensional and technical delivery requirements for this bolt type.

DIN 603 Cup Head Square Neck Bolts are commonly used in timber structures, construction hardware, agricultural equipment, machinery, fencing, furniture, and general mechanical assemblies.

They are available with carbon steel and stainless steel material options, with common strength classes and finishes selected according to the application and purchasing specification.

For international buyers, DIN 603 Cup Head Square Neck Bolts can be supplied in standard metric sizes and lengths, with bulk quantities, custom packaging, and other purchasing requirements available for distributors, wholesalers, OEM buyers, and industrial projects.