The MMC of the hole would be its Minimum diameter The MMC of the shaft would be the Maximum diameter Take a shaft that must go through a hole with clearance between the two. If you want to ensure that two parts never interfere, or limit the amount of interference between the parts when they are at their worst tolerances, MMC can be called out. The only GD&T Symbols where Max Material Condition can be applied are: The other side of the tolerance range would be the Least Material Condition. Max Material Condition is one of the dimensional limits on a part. In each of these cases, the part will have the maximum amount of material that would be allowed within the part tolerances. If it is a pin or external feature: MMC = largest size of the pin If it is a hole or internal feature: MMC = smallest hole size When you have a feature that Geometric Dimensioning and Tolerancing is called on: The callout also removes GD&T Rule#2 which states that all geometry tolerances are controlled independently of the feature size.
Maximum Material Condition or for short, MMC, is a feature of size symbol that describes the condition of a feature or part where the maximum amount of material (volume/size) exists within its dimensional tolerance.
Symbol: Category: Feature of Size Definition:
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