A jet nut,[1] also known as a k-nut,[1][2][3] is a special type of hex locknut that is commonly used in the aerospace and automotive racing industries.
[3] It has a flange on one end of the nut, the hex is smaller than a standard sized hex nut, and it is shorter than a standard hex nut.
It achieves its locking action by using an elliptical offset on the un-flanged end of the nut.
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