How is the projection height specified?

How is the projection height specified?

• A. In the feature control frame as a height value after the projected tolerance zone symbol.
• B. In a separate note.
• C. In the basic dimension line.
• D. In the datum feature symbol.

Answer: (A)

The projection height is defined inside the feature control frame as the height value of the projected tolerance zone. This value specifies how far the tolerance zone extends above the part surface, which is what the positional tolerance will reference when a projection (like a fastener or pin) passes through the mating part. Placing the height in the feature control frame links the projection distance directly to the geometric tolerance being applied. A separate note isn’t the standard way to define this height, basic dimensions aren’t used to describe projected tolerance zones, and the datum feature symbol serves to establish reference points—not the projection distance.

The projection height is defined inside the feature control frame as the height value of the projected tolerance zone. This value specifies how far the tolerance zone extends above the part surface, which is what the positional tolerance will reference when a projection (like a fastener or pin) passes through the mating part. Placing the height in the feature control frame links the projection distance directly to the geometric tolerance being applied.

A separate note isn’t the standard way to define this height, basic dimensions aren’t used to describe projected tolerance zones, and the datum feature symbol serves to establish reference points—not the projection distance.