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In a pre-engineering class in my early college years the topic of the moment was thread pitch, you know, threads per inch. After ten or fifteen minutes of discussion covering fine thread, course thread, pipe thread, metric thread, and bolt diameters a young girl raised her hand and said she was a little confused. She went on to explain that she could sew and knew of thread counts but this threads per inch stuff was new, could somebody help her understand.
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