Quality Measurement: Effects of Screw-Thread Geometry
The screw thread is a fundamental member of technical products from medical devices to space vehicles. With roots dating back to ancient civilization, its continuing presence in the products of this century gives strong evidence of the mechanical efficiency of well-made machine screw threads.
Screw threads work as a set but are usually manufactured separately. This can cause a natural concentration on the internally or externally threaded component, depending on a manufacturer's interest and involvement. The engagement of the external and internal thread is the important factor in understanding screw thread operation.