Dynamic piston rod-brake for cylinders conforming to standard ISO 15552. Can be supplied normally closed only. The peculiarity of this type ABK is to lock the piston rod while moving and to hold it still even in presence of pressure in the chamber. The special feature of the piston-rod brake type ABK is the absolute absence of axial movement and rotation of the cylinders' piston-rod. For the application of the piston rod-brake type ABK to a cylinder ISO 155552, the actuator must be ordered with the rod predisposed for this (extended rod in hardened and chrome plated steel, option B1).