This standard covers requirements for metric high performance thread rolling screws suitable for use in engineering applications. High performance thread rolling screws have performance capabilities beyond those normally expected of other standard types of tapping screws. It is the intent that all types of high performance thread rolling screws shall meet the mechanical and performance requirements specified in this standard with the only difference between types being in their dimensional characteristics. NOTE: The performance requirements covered in this standard apply only to the combination of laboratory conditions described in the testing procedures. If other conditions are met in an actual service application (such as different materials, thicknesses, hole sizes, etc.) drive torque and proof torque values may require adjustment.