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A metric buttress thread is a type of thread, often used in applications requiring high loads in one direction. It's characterized by a non-symmetric profile, with one face of the thread being essentially perpendicular to the screw axis, while the other is angled. This design allows the thread to handle axial thrust effectively, making it suitable for applications like vises, screw-type breechblocks in artillery, and hydraulic machines. Key Features and Characteristics: Non-Symmetric Profile: The most distinguishing feature of a metric buttress thread is its asymmetry. One face of the thread is typically perpendicular or at a slight angle to the screw axis, while the other is angled (often at 45°). Load Handling in One Direction: Buttress threads are designed to handle axial loads (forces pushing along the screw axis) primarily in one direction. High Load Capacity: The long thread base and perpendicular load-bearing face contribute to high shear strength, making buttress threads suitable for applications with high loads. Low Friction: Like square threads, buttress threads offer low friction properties. Easy to Machine: Compared to square threads, buttress threads are easier to machine on a thread milling machine. Compensating for Wear: Buttress threads, like trapezoidal Acme threads, can compensate for nut wear using a split nut. Applications: Construction of Artillery: Buttress threads are frequently used in screw-type breechblocks in artillery. Vises and Screw Jacks: Their ability to handle high loads in one direction makes them suitable for vises and screw jacks. Transmission Devices: They are used in transmission devices where high forces are required in one direction. Hydraulic Machines: Buttress threads find application in hydraulic machines. Lifting Systems: They are used in lifting systems for heavy objects. Motion Threads: Buttress threads can be used as motion threads in tools, collets, and other machinery. Standards and Specifications: DIN 513: This standard specifies the basic dimensions and tolerances for metric buttress threads. IS 4696-3 (2004): This Indian Standard provides dimensions for metric buttress threads. ANSI/ASME B1.9: This American standard specifies the 7°/45° thread profile. B.S 1657: This British standard specifies both 7°/45° and 0°/52° thread profiles.
