Abstract: Gas-cooled slip ring for electrical machines mountable on a slip-ring shaft including a hub fastenable on the slip-ring shaft in insulating relationship thereto, and, a ring flange extending in axial direction from both sides of the hub, the slip ring being formed with a radially outer surface having a multiplicity of mutually adjacent grooves incised therein, and a radially inner surface spaced from the surface of the slip-ring shaft when the hub is fastened thereon and defining therewith a plurality of ring channels serving as coolant gas supply channels, radially inner surface of the ring flange being formed with incised notches shaped as substantially circular segments and extending in radial direction, the incised notches connecting the grooves to the ring channel.