No, The Bear-Loc moves freely when hydraulic pressure is applied. The design provides the proper level of clearance during stoke to prevent contact damage to the rod and its finish. The interior liners are a different material than the steel sleeve and provide the necessary locking friction and force yet provide protection of the rod plating when the lock is engaged. Bear-Locs typically provide continuous service in the field for decades. We recently refurbished a Bear-Loc and cylinder after 50 years of service in a harsh NAVY environment. When used properly to manufacturing specifications and purposes, Bear-Loc provides many years of service.