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Preload is a mechanical engineering term with several meanings. In the general sense, it refers to the internal application of stress to certain mechanical systems. ==Fastener preload== ' The most common usage is to describe the load applied to a fastener as a result of it being installed, before any external loads are applied (e.g. tightening the nut on a bolt). Preload in such cases is important for several reasons. First, a tightened bolt experiences only a small fraction of any external load which is applied later when the joint is in service, so that a fully tightened bolt can (depending on the exact application) sustain a much greater load than loosely tightened bolt. Second, a nut which is correctly tightened will resist coming loose under the influence of vibration, temperature cycling, etc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Preload (engineering)」の詳細全文を読む スポンサード リンク
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