What application is associated with square threads?

Square threads are commonly associated with applications that require high efficiency in transmitting force, particularly in situations involving heavy loading and low friction. One notable application is screw jacks, which utilize square threads to lift heavy loads by converting rotary motion into linear motion efficiently. The design of square threads minimizes the friction encountered during the lifting process, allowing for smoother operation and less wear over time.

In contrast, while lead screws in lathes and machinery also seek to minimize friction, they often use other thread forms, such as trapezoidal threads, due to their ability to handle axial loads effectively along with consistent tension in reciprocating movements. Metric threads used in bolts are primarily designed for fastening and do not utilize a square form, focusing instead on providing strong, secure connections.