In this article the effectiveness of this locking method is investigated and the tightening procedure that should be used if effective locking is to be achieved. The use of two plain nuts goes back at least 150 years based upon observation of historic machinery.

Feb 16, 2021 · When a double nut is used in an attempt to prevent nut loosening and loss of clamp force, the top nut is tightened against the bottom nut (figure 2). With zero distance between the two nuts, the tightening energy bends the threads in the bolt around the top nut instead of stretching the bolt .

The double nut, also known as jam nut, is a friction locking method that uses two separate nuts on top of each other. Care must be taken during the tightening of the second nut as overtightening will lead to thread stripping or tensile rupture of the bolt.

Jul 6, 2021 · Double nut locking principle: To make the nut not loose, it is necessary to increase the friction resistance to stabilize the nut. After the two nuts are tightened, the axial force generated between the nuts increases the friction between the nut teeth and the bolt teeth.

Mar 18, 2024 · While the double nut method can yield an exceptionally strong locking effect, its main drawback lies in the installation complexities, often resulting in inconsistent outcomes. The double nut...

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Double nuts are a type of jam nuts comprising 2 standard nuts. A single bolt shaft is used for threading these nuts together. Properly tightened nuts prevent them from rotating.

Jan 4, 2024 · Putting the thin nut on top of the thick nut, I thought, would assist in preventing the thick nut self-loosening. I had also seen that using two nuts was a popular method on old machinery – and the ones that I had seen all had the thin nut on top of the thick nut.

Apr 1, 2023 · Lock nuts are typically used when it is important to prevent the nut from coming loose, such as in applications where vibration is present. Double nuts are typically used when it is essential to achieve a tight connection, such as in applications with high loads.