This unit consists of an aluminium square profi le with lateral V-guides. The carriage, which is driven by means of a trapezoidal/ballscrew threaded spindle with lead screw, moves along the unit guided by V-slides that are adjustable free of play. Where two linear units are used in parallel or where two carriages are mounted on one unit, the leading-nut receiver can be used to adjust the symmetry of the carriages.