How reliable is a Square Knot under tension?

The Square Knot, commonly used in various applications such as tying two ropes together or securing packages, is known for its limitations under tension. When subjected to significant load or tension, the Square Knot can slip or come undone, which compromises its reliability. Research and practical experience indicate that under these conditions, the knot retains only about 45% of its original strength. This diminished strength is critical to understand, particularly in settings where safety and secure fastening are paramount.

In contrast, some other knots are specifically designed to maintain their integrity under tension, making them more suitable for such applications. Understanding the limitations of the Square Knot is essential when selecting the right knot for specific tasks, especially if they involve heavy loads or critical safety applications.