ACE Stoßdaempfer's PF25 small shock absorbers with special protective cap, prevent rapid failure of the damping elements du to contact with media such as cooling lubricants, bore oils or cleaning agents. The PF25 innovation provides protection in such cases due to the high level of non-reactivity of its material, also known as Teflon. The PF25 succeeds in achieving perfect sealing thanks to an internal screw-thread which corresponds to the external thread of the MC600 series with the dimensions M25x1.5. The screw thread is additionally sealed using a special screw thread protection, so that oils and other liquids cannot penetrate.