What is the practical effect of applying an MMC-based position tolerance to a hole?

What is the practical effect of applying an MMC-based position tolerance to a hole?

• A. It allows the tolerance to expand as hole size moves toward its LMC, providing bonus tolerance under certain conditions.
• B. It narrows the tolerance as the hole approaches LMC.
• C. It fixes the tolerance regardless of hole size.
• D. It only affects the MMC of the mating part.

Answer: (A)

Applying a position tolerance with MMC to a hole means the permissible location error isn’t fixed at one size. The MMC for a hole is the smallest diameter, which is the condition where the feature contains the most material around it. When the actual hole size increases toward its least material condition (toward the largest diameter), the allowable mislocation can grow—this is bonus tolerance. In practice, you can tolerate a larger deviation in the hole’s center as the hole gets bigger (up to the LMC), because the tolerance zone expands with size. This effect is about the hole itself, not the mating part, and it does not keep the tolerance fixed or narrowly limited as the size changes.

Applying a position tolerance with MMC to a hole means the permissible location error isn’t fixed at one size. The MMC for a hole is the smallest diameter, which is the condition where the feature contains the most material around it. When the actual hole size increases toward its least material condition (toward the largest diameter), the allowable mislocation can grow—this is bonus tolerance. In practice, you can tolerate a larger deviation in the hole’s center as the hole gets bigger (up to the LMC), because the tolerance zone expands with size. This effect is about the hole itself, not the mating part, and it does not keep the tolerance fixed or narrowly limited as the size changes.