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==Elliptical offset nuts==
Elliptical offset nuts, also known as '''oval locknuts'''<ref name="McMaster3139"/> or '''non-slotted hex locknuts''',<ref>{{Citation | title = Non-slotted hex locknut | url = http://www.spstech.com/aero/products/nuts/non-slotted-hex.html | accessdate = 2008-11-30}}.</ref> is a nut that has been deformed at one end so that the threads no longer perfectly circular. The deformed end is usually shaped into an ellipse or [[wikt:obround|obround]] triangle. The nut is easily started on the male fastener as the bottom portion is not deformed. As the male fastener reaches the deformed section it deforms the threads of the nut [[elastic deformation|elastically]] back into a circle. This action increases the friction between the nut and the fastener greatly and creates the locking action. Due to the elastic nature of the deformation the nuts can be reused indefinitely.<ref name="smith">Smith, pp. 104–105.</ref>
==Centerlock nuts==
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