This International Standard establishes a metric series of cylinder bore and piston rod diameters for hydraulic and pneumatic cylinders, and specifies for each pair of diameters a corresponding standard ratio between the useful areas. This International Standard applies only to the dimensional criteria of products manufactured in conformity with this International Standard; it does not apply to their functional characteristics.
GSO ISO 3320:2015 history
2015GSO ISO 3320:2015 Fluid power systems and components -- Cylinder bores and piston rod diameters and area ratios -- Metric series