Maximum Material limit and Minimum Material Limit

Shaft

Consider a shaft with a dimension given by 50­­(± 0.05).  Then the shaft is said to have a Maximum Material Limit of 50.05mm because at this limit the shaft have maximum possible amount of metal.  The lower limit 49.95 is the LML of the shaft, because of this limit the shaft have minimum amount jkof material.

Hole

In the case of a hole, the conditions are reversed because a hole of size 50(±0.05), the MML is when lower limit is at 49.05mm because as the lower limit increases the thickness of the hole increase and material needed for producing the hole increases.

The LML is at 50.05 because at their limit the material needed for the hole is minimum.