GB/T 1800.2-2009 Geometrical product specifications (GPS) - Limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts
This part of GB/T 1800 gives values of the limit deviations for commonly used tolerance classes (zones) for holes and shafts calculated from the tables of standard tolerances and fundamental deviations given in GB/T 1800.1. This part of GB/T 1800 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 figure 1).
This part of GB/T 1800 is applicable to the dimensional elements for cylindrical and non-cylindrical plain workpieces.