This document specifies the mechanical and physical properties of tapping screws made of corrosionresistant austenitic, martensitic, ferritic, and duplex stainless steels, with specified grades and hardness classes. ISO 3506-6 provides general rules and additional technical information on suitable stainless steels and their properties (detailed properties of stainless steel grades, corrosion behavior with regards to pitting, crevice and intergranular corrosion, magnetic properties, etc.). WARNING — Tapping screws conforming to the requirements of this document are tested at the ambient temperature range of 10 °C to 35 °C and are used in applications ranging from –20 °C to +150 °C. It is possible that they do not retain the specified mechanical and physical properties at elevated and/or lower temperatures. Therefore, it is the responsibility of the user to determine the appropriate choice based on service environment conditions of the assembly (see also Clauses 5 and 6). This document applies to tapping screws with threads from ST2,2 up to and including ST8, in accordance with ISO 1478. This document does not apply to tapping screws with special properties, such as weldability