When the GB192-197-81 ordinary thread and the GB5796.1~3-83 trapezoidal thread are displayed, the new national standard tolerance band and the cylindrical tolerance band (ie CB1800A～1804-79 tolerance and cooperation) are felt. The confusion is unclear and the concept is rather vague. The normal thread and trapezoidal thread tolerance band code is the same as the cylinder tolerance code, and is composed of two parts: the tolerance level number indicating the size and the letter indicating the position. From the perspective of tolerance, it is the allowable change in size, so both
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