Tensile strength Rm, definitions of mechanical properties for screws | Bossard Group elated documents Home Assembly Technology Expert Technical Information and Tools Technical resources Definitions of mechanical properties for screws Tensile strength Rm [N/mm2] Tensile strength <span>Rm [N/mm2] E-Mail Print Determines how much axial load a screw must withstand without breaking. If full size screws are tested, the yield strength can only be approximately established. Under ISO