DIN 558, ISO 4017, Technical Specification and Weight Chart of Full Threaded Hex Bolts as per DIN 558. DIN standards continue to be used for parts which do not have ISO equivalents or for which there is no need for standardization. The ISO equivalent for DIN 558 Fully Threaded Hexagon Screws/Bolts is ISO 4018. Stainless steels can be divided into three groups of steel – austenitic, ferritic and martensitic.