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The concept of left-hand threading dates back centuries, originating from a need to counteract clockwise torque forces. In machinery, these forces can cause standard right-hand threads to loosen over time due to continuous rotation. For instance, in bicycle pedals or the steering mechanism of cars, left-hand threads are used to prevent accidental loosening under load. They tighten as they are turned counterclockwise, ensuring a secure hold.

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HEBEI YUETONG FASTENERS 3 48 threaded rod