Distorted thread locknut
Type of locknut
A distorted thread locknut, is a type of locknut that uses a deformed section of thread to keep the nut from loosening due to vibrations, or rotation of the clamped item. There are four types: elliptical offset nuts, centerlock nuts, toplock nuts and partially depitched (Philidas) nuts.
High temperature use
Because these nuts are solid metal, they remain effective at high temperatures, unlike nyloc nuts. High-grade nuts can withstand temperatures up to 1,400 °F (760 °C).
Safety factors
High-strength distorted thread nuts cannot be used with low-strength fasteners because the hard nut will act like a die and destroy the threads on the fastener.
Elliptical offset nuts
Elliptical offset nuts is a catch-all category that encompasses designs known as oval locknuts or non-slotted hex locknuts,. The salient feature is that the thread has been deformed at one end so that the threads are no longer perfectly circular. The deformed end is usually shaped into an ellipse or obround triangle. These are known as one-way nuts as the nut may be easily started on the male fastener from the bottom non-deformed portion but is practically impossible to start from the deformed end. As the male fastener reaches the deformed section it stretches the threads of the nut elastically back into a circle.
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