Steel carriage bolts in property class 8.8 are used for fastening timber and metal components where higher mechanical strength is required compared to property class 4.6 carriage bolts. The bolts feature a rounded head and square neck that resists rotation during tightening when properly engaged with the surrounding material. The range mainly includes DIN 603 / ISO 8677 carriage bolts in various dimensions, lengths and surface treatments. The rounded head provides a smooth external surface without a tool recess, while property class 8.8 according to ISO 898-1 defines the mechanical properties of the bolt. Property class 8.8 carriage bolts are used in machinery, industrial assembly and structural applications where both head geometry and mechanical strength are important. Surface treatments are selected according to environmental exposure and corrosion protection requirements.