HECO-TOPIX-plus Kombisechskantkopf T-40 8,0 x 120, znb

Carbon steel has different mechanical properties depending on the carbon content. Low-carbon steels are weaker and softer but are easily machined and welded, while high-carbon steels are stronger but significantly more difficult to machine. All carbon steels are susceptible to rust, making them unsuitable for many end uses.

Electroplating is a so-called electrolytic process. The coating is applied in accordance with the DIN EN ISO 4042 standard. Blue-passivated surfaces appear white to blue or with a bluish iridescence. Coating thickness: 8–10 my.

The wrench sizes for hexagonal bolts and nuts are specified in ISO 272: 1982-01. The additional internal hexagon/T-drive is used for re-tightening or in confined spaces. Torque is transmitted more directly via the radial sections of the tooth flanks rather than via the almost tangential surfaces of the hexagon.