Let’s say you want to ensure two parts never interfere, or you’d like to limit the amount of interference between parts when they are at their worst tolerances. – True Position (the most common use for MMC) The only GD&T symbols where you can apply Maximum Material Condition are: The other side of the tolerance range would be the Least Material Condition. Maximum Material Conditional is one of the dimensional limits on a part. On drawings, MMC is written simply as an M inside a circle: Likewise, it is the largest pin diameter because a smaller diameter would remove material. It is the smallest hole diameter because a larger hole removes material, hence the smallest diameter provides for the greatest amount of material. Maximum Material Condition (MMC) refers to a feature-of-size that contains the greatest amount of material, yet remains within its tolerance zone. – Ball Bearing diameter (a spherical surface) Maximum Material Condition (MMC) – Pin and Boss diameters (also cylindrical surfaces) ![]() ![]() – Plate thicknesses (two opposed parallel surfaces) – Hole diameters (which are cylindrical surfaces) Typical examples of features of size include: Surfaces and sets of parallel surfaces associated with a size dimension are called features-of-size (FOS). Beginner’s Guide to GD&T Maximum Material Condition Feature-Of-Size (FOS)
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