How is the height of a projected tolerance zone specified?

• A. In the datum references.
• B. In the callout as the projection height.
• C. In the material specification.
• D. In the production process note.

Answer: (B)

The height of a projected tolerance zone is defined right in the feature control frame as the projection height. This value specifies how far the tolerance zone should extend above the part surface to simulate the actual engagement of a fastener or pin during assembly, ensuring the positional tolerance remains valid for the assembled condition. It’s not determined by datums, material specifications, or production process notes. Those elements define references, materials, or manufacturing notes, but they don’t set how far the zone projects.