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An '''elliptical offset locknut''', also known as a '''non-slotted hex nut''',<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 (hardware)|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>
Because these nuts are solid metal, they are effective in elevated temperature settings, unlike [[nyloc nut]]s. High [[Bolted joint#Property class|grade]] nuts are good up to {{convert|1400|F|C|abbr=on}}. High strength elliptical offset nuts cannot be used with low strength fasteners because the hard nut will act like a [[tap and die|die]] and destroy the threads on the fastener.<ref name="smith"/>
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