Abstract: A hot runner system for use in combination with plastics molding tools for injection molding of plastics material with injection from several sprues comprises a central inlet member, heated runners for distributing from the central inlet member plastics material to a number of sprue bushes in which heating cartridges are inserted. The sprue bushes are fixed by securing means to a platen and form, together with said platen and said inlet member, a stationary and mechanically rigid assembly wherein contact between hot parts of the sprue bushes and the platen occurs only in rotationally symmetrical contact surfaces. The heated runners are individually movable relative to said assembly, but such movements will not affect the positions of the sprue bushes or the central inlet.