Which condition should be avoided when using self-locking nuts?

Self-locking nuts are designed to resist loosening due to vibration and other dynamic forces, making them effective in various applications. However, when self-locking nuts are used at rotating joints, the constant movement and friction can lead to wear and degradation of the locking mechanism. This wear can diminish the effectiveness of the self-locking feature, potentially resulting in a loose connection that compromises the integrity and safety of the assembly.

In contrast, using self-locking nuts with stainless steel bolts is a common practice as long as compatibility is ensured, and exposure to high temperatures can often be tolerated depending on the materials' specifications. Humidity might present some concerns regarding corrosion, but it does not inherently affect the locking properties of the nut. Therefore, the application of self-locking nuts at rotating joints is the condition that poses the greatest risk, making it critical to avoid this practice to maintain secure and reliable connections.