UNE-EN ISO 3506-4:2025

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.