Gives the mounting dimensions required for interchangeability of rod end spherical eyes of hydraulic cylinders. The eyes are used on piston rods of hydraulic cylinders for mechanically transmitting the cylinder force under oscillatory rotational and tilting movements. Their design is based on the maximum forces resulting from the specified internal diameter of the cylinders and pressures according to ISO 3320 and ISO 3322. This standard only applies to dimensional criteria not to functional characteristics.