Buttress thread
Screw thread profile with an asymmetric square/slanted shape / From Wikipedia, the free encyclopedia
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Buttress thread forms, also known as sawtooth thread forms[1] or breech-lock thread forms.[2] are screw thread profiles with an asymmetric shape, having one square face and the other slanted. They are most commonly used for leadscrews where the load is principally applied in one direction. The asymmetric thread form allows the thread to have low friction and withstand greater loads than other forms in one direction, but at the cost of higher friction and inferior load bearing in the opposite direction. They are typically easier to manufacture than square thread forms but offer higher load capacity than equivalently sized trapezoidal thread forms.