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ISO 3320:2013
Fluid power systems and components - Cylinder bores and piston rod diameters and area ratios - Metric series
ISO 3320:2013 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.
It applies only to the dimensional criteria of products manufactured in conformity with ISO 3320:2013; it does not apply to their functional characteristics.
International Organization for Standardization [iso]