What is the effect of a projected tolerance zone on depth-limited features?

• A. It may extend the tolerance zone in projection direction beyond the actual feature depth to accommodate mating features
• B. It cannot extend beyond the feature depth
• C. It only applies to surfaces, not holes
• D. It reduces the tolerance as depth increases

Answer: (A)

Projected tolerance zones allow the permissible variation to continue beyond the actual depth of a depth-limited feature in the projection direction. This extension is defined by the projection distance in the feature control frame and is used to accommodate mating features (such as pins, dowels, or fasteners) that will project into or through the feature during assembly. Even if the hole or stud itself is shorter than the mating part, the tolerance zone remains active along the projected length, ensuring proper fit and function at the location where the parts come together. The options that claim the zone cannot extend beyond depth, apply only to surfaces, or reduce tolerance do not reflect how projected tolerance zones interact with depth-limited features.