ISO 4393:1978

Fluid power systems and components — Cylinders — Basic series of piston strokes

It specifies the preferred series of piston strokes for application to single-acting and double-acting, hydraulic and pneumatic fluid power cylinders. The figure shows the identification of piston strokes. It tabulates piston strokes from 25 mm up to and including 500 mm. If an extension of the series shown is required, use the rounded-off R 10 series of values as shown in ISO 497.