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An interference fit, also known as a press fit or friction fit, is a fastening between two parts which is achieved by friction after the parts are pushed together, rather than by any other means of fastening. For metal parts in particular, the friction that holds the parts together is often greatly increased by compression of one part against the other, which relies on the tensile and compressive strengths of the materials the parts are made from. Typical examples of interference fits are the press fitting of shafts into bearings or bearings into their housings and the attachment of watertight connectors to cables. An interference fit also results when pipe fittings are assembled and tightened. A press fit is also required to mount wheels on an axle to make a wheel set. ==Introducing interference between parts== An interference fit is generally achieved by shaping the two mating parts so that one or the other, or both, slightly deviate in size from the nominal dimension. The word ''interference'' refers to the fact that one part slightly interferes with the space that the other is taking up. For example, a shaft, or an axle, may be ground slightly oversize and the hole in the bearing, or the wheel, (through which it is going to pass with an interference fit) may be ground slightly undersized. When the shaft is pressed into the bearing, or when the wheels and roller bearings are pressed onto an axle as in the case of a wheel set, the two parts interfere with each other's occupation of space. The result is that both parts elastically deform slightly to fit together creating an extremely high force which results in extremely high friction between the parts—so high that even large amounts of torque cannot turn one of them relative to the other; they are locked together and turn in unison. These fits though applicable to shaft and hole assembly, is more often used for bearing-housing or bearing-shaft assembly. 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「interference fit」の詳細全文を読む スポンサード リンク
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