According to the definition, tolerance refers to the generally accepted allowable deviation in length or thickness. According to the steel production standards of various countries, it is difficult for various reasons during the plate production process. The actual thickness often does not reach the theoretical thickness. For example, a 6 mm plate is only 5.6 mm. It is the tolerance. In China, the tolerance is often negative. Of course, there are positive tolerances, but they are very few. When buying and selling boards, they are usually calculated based on the theoretical thickness. This is why the theoretical price is lower than the weighing price. Tolerances vary by size, and the prices are also different. The price with a large tolerance is cheaper. For example, 6 mm, if it is below 5.5, it is a large tolerance.

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