Series 40 cylinders have been designed in compliance with ISO 15552 standards and with the previous DIN/ISO 6431 - VDMA 24562 standards. A permanent magnet on the piston of these cylinders is able to send, through proximity switches mounted on the cylinder sliding axis, electrical signals to indicate its position.
This series is normally equipped with end-stroke cushioning which can be adjusted through a screw on the end block. In order to quieten the impact of the piston on the end block, these cylinders are also equipped with mechanical cushioning.