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The origin of the 20mm threaded bar can be traced back to the early 20th century when engineers began to recognize the need for a strong and reliable connection between different structural elements. Initially, they used plain bars with screw threads at each end to connect beams, columns, and other structural components. However, this method had several limitations, including the risk of thread stripping and the difficulty of tightening the bars uniformly.

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three quarter inch threaded rod