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Square thread form
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<p>The square thread form is a common <a href="/facts/Screw_thread/dqGzDfHv">screw thread</a> profile, used in high load applications such as <a href="/facts/Leadscrew/8vsogz4d">leadscrews</a> and <a href="/facts/Jackscrew/B9kjdeBt">jackscrews</a>. It gets its name from the square cross-section of the thread. It is the lowest friction and most efficient thread form, but it is difficult to fabricate. </p>