iso2768标准一般公差表1长度允许偏差除破损边外公差等级基本尺寸mm符号内容053大于36大于630 ISO2768-mH[1] ISO 2768-mH Tolerances for linear dimensions: class 400-1000-2000- 1000 2000 4000 120-400m Permissible deviations for broken edges (external radii and chamfer heights): Tolerance Permissible ...