Gives required mounting dimensions for interchangeability of rod end plain eyes of hydraulic cylinders, designed specifically for use with cylinders manufactured according to ISO 6020-1 and ISO 6022, but this does not limit application. For use on piston rods of hydraulic cylinders for mechanically transmitting cylinder force. The design is based on maximum forces which result from specified internal cylinder diameters and pressures according to ISO 3320 and ISO 3322.