Bearing Elements and Anti-Extrusion Rings

Chesterton® replaceable Bearing Bands are the solution to costly cylinder re-machining and repairs for hydraulic or pneumatic equipment. These split, replaceable bearing bands minimize metal-to-metal contact of moving parts and help prolong equipment life. When installed during the cylinder repair, the risk of recurring damage is  significantly reduced.

Chesterton® Anti-Extrusion Rings, often referred to as back-up rings, have no intended sealing function. They provide protection to pressurized dynamic and static seals (including O-Rings) from extruding into equipment clearances while under pressure, thus protecting seal components from premature failure and prolonging their service life. Protection is provided by tight fit of the anti-extrusion rings in the seal groove to minimize the extrusion gap.