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Spherical Bearings are structural bearing which consists of a set of concave & convex mating backing plates with a low friction sliding interface in between thereby permitting rotation by incurving sliding. Spherical Bearings are made of hardened carbon chromium , hardened stainless , or copper alloy. The sliding surfaces between these types of spherical plain bearings could have hard chromium plating, PTFE composite, PTFE fabric, or PTFE plastic to reduce wear.