The standard is divided into two primary parts, which are often sought together in technical documentation or as an ISO 286 PDF for engineering reference:
By combining different hole and shaft tolerance classes, engineers create three primary types of fits:
The ISO 286 system uses an alphanumeric code to define a (e.g., H7 or g6 ). iso 286 pdf
This part provides tabulated numerical data for limit deviations based on the nominal size of the part (up to 3,150 mm). Key Components of the ISO 286 System
This part defines the basic terminology, symbols, and principles of the system, including the concepts of clearance, interference, and transition fits. The standard is divided into two primary parts,
Indicates the position of the tolerance zone relative to the nominal (basic) size.
and "h" (shaft) denote the zero line, where the lower (for holes) or upper (for shafts) limit deviation is zero. Indicates the position of the tolerance zone relative
(A–ZC) are used for internal features ( holes ).
ISO 286-1:2010(en), Geometrical product specifications (GPS)
The standard is the internationally recognized system for limits and fits in mechanical engineering. It provides a standardized framework for defining tolerances on linear sizes, primarily for cylindrical features like holes and shafts , ensuring that mating parts from different manufacturers can be assembled interchangeably. Structure of the ISO 286 Standard