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knipping fastener gaskets are mechanical seals between two objects, typically used as spacers to prevent pressure and corrosion between the two objects. They are also used to distribute the load of threaded fasteners and prevent leakage in pipelines due to natural thermal expansion and contraction. Belleville washers, wave washers, wear-resistant pads, preload indicators, locking devices. Since machined surfaces cannot be perfect, gaskets are used to fill irregularities. Materials include stainless steel and carbon steel; carbon steel is essentially iron. Gaskets are made by winding metal strips (generally v shaped metal strips) with non-metallic strips.