What is the result of applying a position tolerance to a hole with an MMC modifier?

• A. The tolerance zone becomes fixed and independent of hole size.
• B. The hole cannot exceed the datum reference frame.
• C. The position tolerance is eliminated.
• D. The tolerance zone is controlled by the hole's MMC; the actual tolerance may vary with size.

Answer: (D)

When a position tolerance has an MMC modifier on a hole, the allowed true position is not a single fixed value. The MMC for a hole is the smallest diameter, so as the actual hole size varies, the position tolerance can change. This creates a bonus-style effect: if the hole ends up larger than its MMC, the tolerance zone for the hole’s axis expands by the amount the size exceeds MMC, giving more leeway for true position. If the hole is exactly at MMC, you use the base, fixed tolerance. Because of this link between actual size and the tolerance, the effective positional tolerance is not constant—it's controlled by the hole’s MMC and can vary with size.