BS EN ISO 286-2:2010

Calculated from the information given in Part 1.

This part of ISO286 gives values of the limit deviations for commonly used tolerance classes for holes and shafts calculated from the tables given in ISO286‑1. This part of ISO286 covers values for the upper limit deviations ES (for holes) and es (for shafts), and the lower limit deviations EI (for holes) and ei (for shafts) (see Figures1 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 EI 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: cylinders;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 ISO286 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 ISO286‑1. Figure1 Upper and lower limit deviations for holes (internal features) Key 1 K1 to K3, and also K4 to K8, for nominal size ≤ 3mm 2 K4 to K8, for sizes for which 3mm < nominal size ≤ 500mm 3 K9 to K18, and also K4 to K8 for nominal size > 500mm 4 M1 to M6 5 M9 to M18, and also M7 to M8 for nominal size > 500mm 6 N1 to N8 and also N9 to N18 for sizes for which 1mm < nominal size ≤ 3mm, as well as nominal size > 500mm 7 N9 to N18 for sizes for which 3mm < nominal size ≤ 500mm Figure2 Upper and lower limit deviations for shafts (external features) Key 1 j5, j6 2 k1 to k3, and also k4 to k7 for nominal size ≤ 3mm 3 k4 to k7 for sizes where 3mm < nominal size ≤ 500mm 4 k8 to k18, and also k4 to k7 for sizes > 500mm