ButtressGewinde

Buttress Gewinde, or buttress thread, is a screw thread form designed to transmit axial thrust mainly in one direction. It is an asymmetric profile, with one flank steeper and forming the primary load-bearing surface while the opposite flank is flatter or nearly perpendicular to the axis. This geometry provides high load-carrying capacity in the intended direction and easier engagement when the screw is moved in the reverse direction.

Versions of buttress thread exist in metric and imperial standards, and a matching female component (nut or bore) must have the same buttress profile to ensure proper engagement. The form is less common than standard symmetric V-threads, but it is standardized for specific applications where thrust is predominantly unidirectional, such as leadscrews, thrust screws, and certain adjustment mechanisms in hydraulic and aerospace components.

Applications and use cases include adjusting screws, jacks, machine tool leadscrews, clamps, and other devices where a strong, directional thrust is required. Because of the asymmetry, buttress threads are not interchangeable with conventional threads and require corresponding female parts.

Manufacturing and tolerance: buttress threads can be produced by turning, milling, or thread rolling, and require appropriate tooling or dies to generate the asymmetric profile. Proper lubrication and fit are important to achieve the desired load capacity and to minimize wear. While they offer advantages for unidirectional loading, their specialized profile can complicate manufacturing and part sourcing compared with standard threads.