本文件说明了使用尺寸规范控制线性或角度尺寸以外的特性所引起的歧义，以及使用几何规范的好处。尺寸公差可以用±公差或几何规范表示。附件A中解释了因对线性尺寸或角度尺寸以外的尺寸使用±公差（根据ISO 2768-1和ISO 8062-3的个别公差和一般公差）而引起的歧义。注1:如本文件所示，图中所示仅为文字说明，并不反映实际使用情况。因此，这些数字被简化，只表明有关的原则。注2:有关尺寸规格的说明，请参见以下内容:-ISO 14405-1线性尺寸；-ISO 14405-3角尺寸；-楔块的ISO 2538-1和ISO 2538-2；-锥的ISO 3040。注3:ISO 1101给出了几何规范的规则。

This document illustrates the ambiguity caused by the use of dimensional specifications to control properties other than linear or angular size and the benefit of using geometrical specifications instead. Dimensional tolerancing can be indicated by ± tolerancing or geometrical specifications. The ambiguity caused by using ± tolerances for dimensions other than linear or angular sizes (for individual tolerances and general tolerances according to, e.g. ISO 2768-1 and ISO 8062-3) is explained in Annex A. NOTE 1 The figures, as shown in this document, merely illustrate the text and are not intended to reflect actual usage. The figures are consequently simplified to indicate only the relevant principles. NOTE 2 For indications of dimensional specifications, see the following: — ISO 14405-1 for linear size; — ISO 14405-3 for angular size; — ISO 2538-1 and ISO 2538-2 for wedges; — ISO 3040 for cones. NOTE 3 The rules for geometrical specifications are given in ISO 1101.