International standard ISO 6020-1 hydraulic cylinders
Part 1: Medium series
Hydraulic fluid power? Mounting dimensions for single rod cylinders, 16 MPa (160 bar ) series
The medium series dimensions are applicable to round head cylinders with bores from 25mm to 200mm and to both round or square head cylinders with bores larger than 200 mm, thus allowing a wider range of applications. They admit larger parts with longer cushions that are particularly suitable for applications requiring higher velocity and rapid decelerations.
NOTE- This part of ISO 6020 allows manufacture of hydraulic equipment, freedom in the design of metric cylinders and does not restrict technical development but does provide basic guideline.