ISO Series standard cylinders are manufactured according to ISO6431, ISO 6432 standard and VDMA24562 standard. ISO Series standard cylinders, DNS, DSNUFesto Type. 6431/ DIN24335/ VDMA 24562/ FVBC/ DNC Series Standard Cylinder.Aluminum FESTO type DNC Pneumatic Cylinders are manufactured according to ISO6431 standard and VDMA24562 standard.