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A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts.
A spare part, spare, service part, repair part, or replacement part, is an interchangeable part that is kept in an inventory and used for the repair or refurbishment of defective equipment/units.
Dies and moulds are both tools for shaping. Dies are used to shape sheet metal and other metal forms. A typical application is the making of automobile body parts.