Eyebolts DIN 580-case-hardened steel C15E M18

Steel is an iron-carbon alloy with a maximum carbon content of 2% by mass. The steels achieve their intended physical and mechanical properties through various hardening, annealing and tempering processes. It is also possible to harden the edge zone by surface hardening, case hardening or nitriding. Well-known steel grades are structural steels, free-machining steels, case-hardening steels, nitriding steels, tempering steels, tool steels and stainless steels.

The term plain indicates a completely untreated, merely oiled, smooth surface for all DIN and ISO screws such as wood screws, hexagon head screws, threaded rods, nuts and many types of washers.

According to the chemical composition, C15 (1.0401) is an unalloyed quality steel, C15E (1.1141) is an unalloyed stainless steel, with the difference being the permissible sulfur and phosphorus content. Both types of steel are classified as case-hardened steels depending on their intended use (carbon content less than 0.20%). The materials in this category are characterized in their initial state by good processing properties when machining and forming.