(A–ZC) are used for internal features ( holes ).
Indicates the position of the tolerance zone relative to the nominal (basic) size. iso 286 pdf
This part defines the basic terminology, symbols, and principles of the system, including the concepts of clearance, interference, and transition fits. (A–ZC) are used for internal features ( holes )
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 and principles of the system
and "h" (shaft) denote the zero line, where the lower (for holes) or upper (for shafts) limit deviation is zero.
