ISO 286-2-2010 pdf free download.Geometrical product specifications (GPS)一ISO code system for tolerances on linear sizes – Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts.
This part of ISO 286 gives values of the limit deviations for commonly used tolerance classes for holes and shafts calculated from the tables given in ISO 286-1. This part of ISO 286 covers values for the upper limit deviations ES (for holes) and es (for shafts), and the lower limit deviations El (for holes) and el (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.
The ISO system for tolerances on linear size provides a system of tolerances and deviations suitable for features of the following types:
a) cylinders;
b) two parallel opposite surfaces.
For simplicity, and also 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 of ISO 286 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 ISO 286-1.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 286-1 :20 10. Geometrical product specifications (GPS) — ISO code system for tolerances of linear sizes — Part 1: Basis of tolerances, deviations and fits
3 Standard tolerances
The values of standard tolerance grades ITO1 to IT1 8, inclusive, are given in Table 1.
4 Limit deviations for holes
A synoptic representation of the tolerance classes for holes, as given in this part of ISO 286, is shown In Figures 3 and 4.
Attention is drawn to the fact that the tolerance classes shown in Figures 3 and 4, and their limit deviations given In Tables 2 to 16, are not intended to give detailed directives on the selection of tolerance classes for any purpose. Recommendations for the selection of tolerance classes are given in ISO 286-1:2010, Subclause 4.4 and Clause 5.
NOTE Some tolerance classes are only provided for a restricted number of nominal size ranges For further information, see 6.1.
5 Limit deviations for shafts
A synoptic representation of the tolerance classes for shafts, as given in this part of ISO 286, is shown in Figures 5 and 6.
Attention is drawn to the fact that the tolerance classes shown in Figures 5 and 6, and their limit deviations given in Tables 17 to 32. are not intended to give detailed directives on the selection of tolerance classes for any purpose. Recommendations for the selection of tolerance classes are given in ISO 286-1:2010, Subclause 4.4 and Clause 5.
NOTE Some tolerance classes are only provided for a restricted number of nominal size ranges For further information, see 6.1.
6 Presentation of Tables 2 to 32
6.1 Values may be calculated, from the tables given in ISO 286-1, for fundamental deviations used for tolerance classes for which there is no entry in the tables but for which the space has been left blank.
6.2 A small horizontal separation has been inserted in the tables, where appropriate, to distinguish between values for nominal sizes less than oc equal to 500 mm and those greater than 500 mm.ISO 286-2 pdf download.