BASIC DYNAMIC AXIAL LOAD Cam: Is the axial load concentric with the axis and constant, in movement with which a sufficient group of identical ballscrews reach a service life of 1 million revolutions.

BASIC STATIC AXIAL LOAD Coam: Is the axial load concentric with the axis, that can be applied to the assembly at rest, that causes a permanent deformation of 0,0001 x ball diameter, between the ball and the rolling track.

LIFE L: Nominal life is defined by the number of revolutions reached by 90 % of sufficient group of identical ballscrews, before appearance of the first visible signs of the material fatigue, in any of the rolling elements.