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  • Screw profile

    Metric thread in MM (millimeter) as the unit, its tooth Angle of 60 degrees. American thread and inch thread is for the unit in inches. Usmade thread tooth Angle is 60 degrees, the inch thread tooth A...

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  • The history of hardware

    Hardware: the traditional metal products, also known as "hardware". Refers to the gold, silver, copper, iron, tin, five metals. The artificial processing can be made into a knife, sword, art or metal ...

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