International difference between the hole dimension and shaft dimension for any type of fit is called allowances.

Shrinkage fit A shrinkage fit is obtained by making the shaft (internal member) slightly larger than the hole (external member). In shrinkage fit, pressure is not required for assembling but instead the hole (external member) is heated and expanded sufficiently to permit the shaft (internal member) to be inserted easily. Then the hole (external member) is cooled to shrink tightly around the shaft (internal member).