This part of ISO 3506 specifies the mechanical properties of tapping screws made of austenitic, martensitic and ferritic steel grades of corrosion-resistant stainless steels, when tested over an ambient temperature range of 10 °C to 35 °C. Properties vary at higher or lower temperatures.It applies to tapping screws with threads from ST2,2 up to and including ST8, in accordance with ISO 1478.It does not apply to screws with special properties, such as weldability.NOTE The designation system of this part of ISO 3506 can be used for sizes outside the limits given in this clause (e.g. d > ST8), provided that all applicable mechanical and physical requirements o