Left-handed threads

**Left-handed threads** are a type of screw thread that winds in the opposite direction to the more common right-handed threads. While standard threads tighten clockwise, left-handed threads tighten counterclockwise. They are typically used in applications where rotation or vibration might cause right-handed threads to loosen, such as in certain automotive parts, machinery, and safety devices. This tag can help categorize content related to mechanical engineering, fasteners, and specialized threading techniques.