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Maximum Material Condition : GD&T Basics

Maximum Material Condition (MMC) is a condition of a feature (hole or pin) of a part where maximum material  condition exists.

 


 

Maximum Material Condition For a Hole

Maximum Material Condition for a hole will be smallest hole size. E.g. for a hole of 15 mm diameter with tolerance limit of ± 0.2 mm, MMC will be 14.8 mm 

 

 


 

Maximum Material Condition (MMC) For Shaft

Maximum Material Condition for a pin will be largest size of the pin. E.g. For a pin of 15 mm diameter with tolerance limit of ± 0.2 mm, MMC will be 15.2 mm

 

 

 


Maximum Material Condition Can be used with Following Tolerance:


Why Maximum Material Condition is used:

 

MMC is used to make sure, even is worst condition we get a part within tolerance limit. When we add MMC modifier along with geometrical tolerance it provides additional tolerance .


 

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