ChinaAutoRegs｜GB/T 1800.2-2020英文版翻译 产品几何技术规范（GPS）线性尺寸公差ISO代号体系 第2部分：标准公差带代号和孔、轴的极限偏差表
Geometrical Product Specifications (GPS)—ISO Code System for Tolerances on Linear Sizes—Part 2: Tables of Standard Tolerance Classes and Limit Deviations for Holes and Shafts
1 SCOPE
This part of GB/T 1800 specifies values of the limit deviations for commonly used tolerance classes for holes and shafts calculated from the tables of standard tolerances and fundamental deviations given in GB/T 1800.1. This part covers values for the upper limit deviations ES (for holes) and es (for shafts), and the lower limit deviations El (for holes) and ei (for shafts) (see Figures 1 and 2).
Note: In the tables of limit deviations, the values of the upper limit deviation ES or es are shown above the values of the lower limit deviation El or ei except for tolerance classes JS and js which are symmetrical about the zero line.
This part has established the ISO code system for tolerances on linear sizes, which is applicable to the features of the following types:
a) cylinders;
b) two parallel opposite surfaces.
For simplicity, and because of the importance of cylindrical workpieces of circular section, only these are referred to explicitly. It should be clearly understood, however, that the tolerances and deviations given in this part equally apply to workpieces of other than circular sections.
In particular, the term “hole” or “shaft” is used to designate features of the cylinder type (e.g. for the tolerancing of the diameter of a hole or shaft) and, for simplicity, these terms are also used for two parallel opposite surfaces (e.g. for the tolerancing of the thickness of a key or the width of a slot).
For further information on terminology, symbols, the basis of the system, etc., see GB/T 1800.1.
2 NORMATIVE REFERENCES
The following documents contain provisions which, through reference in this text, constitute indispensable provisions of this document. For dated references, only the editions cited apply. For undated references, the latest editions of the normative document (including any amendments) apply.
GB/T 1800.1-2020 Geometrical product specifications (GPS)—ISO code system for tolerances on linear sizes—Part 1: Basis of tolerances, deviations and fits
3 STANDARD TOLERANCES
The values of standard tolerance grades IT01 to IT18 are given in Table 1.
4 LIMIT DEVIATIONS FOR HOLES
The codes of tolerance classes for holes, as given in this part, of nominal sizes less than or equal to 500mm, are shown in Figure 3, and of nominal sizes greater than 500mm and less than or equal to 3,150mm, are shown in Figure 4, and their limit deviations are given in Tables 2 to 16.
Recommendations for the selection of codes of tolerance classes are given in Sub-clause 4.4 and Clause 5 of GB/T 1800.1-2020.
Note: Some codes of tolerance classes are only provided for a restricted number of nominal size ranges. For further information, see 6.1.
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