In the case of a commutator for electrical machines, having segments (1) which are spaced apart from one another by means of insulating laminates and form at least one seat which is concentric with respect to the commutator longitudinal axis, for a prestressed reinforcing ring (14) which is kept at a distance from this seat by an insulating layer (11) which is resistant to pressure and heat, the insulating layer (11) consists of plastically deformed insulating laminate material. <IMAGE>
