Length-adjustable column for tables, chairs or the like

A length-adjustable column for chairs or tables, comprising a stand pipe (1, 1') and one of a pneumatic and a hydropneumatic length-adjusting element arranged therein concentrically of a common central longitudinal axis (3) and of which a cylindrical housing (4) is radially supported in the stand pipe (1, 1') and is slidably guided in the direction of a central longitudinal axis (3) and of which a piston rod (6), adjacent to a free end, is arrested on a bottom plate (8) engaged to the stand pipe (1, 1') in the direction of a central longitudinal axis (3), wherein the stand pipe (1, 1') is in the form of a composite pipe integrally injection-moulded of plastic material and consists of an outer tube (16) and an inner guide tube (5, 5') supported against said outer tube (16) by guide webs (18), and wherein partial cylindrical surfaces (25, 25'), which are concentric of the central longitudinal axis (3) and formed by chip removal on an internal surface (22, 22') of the inner guide tube (5, 5') and separated from each other by recesses (24, 24'), are formed as guide surfaces for the housing (4).