This hex nut, manufactured to ISO 4032 standards, is made from C35 steel (AD-W7) with a plain finish—meaning the steel has no coating or surface treatment and, on its own, offers minimal protection against corrosion. Featuring a metric thread, the nut is designed for use in pressure vessels, steam equipment, machinery, and flange connections at temperatures ranging from -10 °C to +300 °C. It meets the requirements of AD2000-W7, TRD106, and DIN 267-13. Manufacturers listed in VdTÜV-Merkblatt 1253/4 are permitted to substitute an EN 10204 3.1 certificate with a manufacturer and strength class marking, a practice also recognized by Lloyd's Register Energy.