scope:

This standard applies to heat treated thread cutting screws (hexagon head and slotted head thread cutting screws) with an ISO metric thread as specified in DIN ISO 261, with cutting flutes extending from the point of the screw to its head, and designed to cut their mating thread during assembly. For head styles of the screws, see the relevant DIN Standards in Clause 3. See DIN ISO 8992 for general requirements and DIN EN ISO 3269 for acceptance inspection.

The specifications of this standard are intended to ensure that, provided they are not overstressed, thread cutting screws are capable of performing the above functions without their own thread fracturing or becoming deformed. To that end, requirements for assessing mechanical and functional characteristics of thread cutting screws have been specified for:

- surface hardness;

- minimum torque;

- minimum ultimate tensile;

- thread cutting capability