A longitudinal adjuster for a vehicle seat may have a first rail and a second rail. The rails may form an internal channel and the first rail may be displaceable relative to the second rail in the longitudinal direction. A spindle nut may be connected to the second rail and a spindle which cooperates with an internal thread of the spindle nut and may have an external thread may be arranged in the internal channel. A spindle gear mechanism, which can be driven by a motor and which cooperates with the spindle, may be arranged on an end of the first rail. A damping element may be provided and arranged such that the spindle and the spindle nut are held in a pretensioned manner relative to one another in the axial direction and/or in the radial direction. A vehicle seat may have the longitudinal adjuster.

In a spindle system with a hollow spindle for a linear actuator, the linear actuator has a telescopic tube system including an outer tube and at least one inner tube arranged coaxially with the outer tube and at least partially surrounded by the outer tube. A bearing is arranged to transmit axial forces between the hollow spindle and the outer tube. The hollow spindle at least partially surrounds an inner shaft of the spindle system and is connected to the inner shaft of the spindle system by one or more tappets of a positive and axially displaceable shaft-hub connection. The hollow spindle has a bearing seat for the bearing and an external thread on an outer side.