Threads in manufacturing are helical grooves or ridges cut into parts, typically on bolts, screws, or nuts, to allow mechanical fastening through screwing or twisting. Threads can be external (on bolts) or internal (on nuts) and are defined by parameters such as pitch (distance between threads), diameter, and thread profile. Accurate threading ensures proper engagement between components, providing secure connections that can withstand mechanical forces. In manufacturing, precise thread cutting or molding improves assembly efficiency and ensures product durability. For example, using standardized thread forms like ISO or UNC threads guarantees compatibility across various components and machinery.