What is the tolerance zone value for the described GD&T feature?

What is the tolerance zone value for the described GD&T feature?

• A. 0.20
• B. 0.50
• C. 0.08
• D. 0.12

Answer: (D)

The tolerance zone value is the size of the permissible deviation region for the geometric characteristic. In GD&T, when you see a position tolerance with a diameter symbol, it creates a cylindrical tolerance zone around the true position. The axis of the feature must lie within that cylinder, whose diameter equals the tolerance value specified. For this described feature, that cylinder has a diameter of 0.12, so the hole’s axis must stay within a 0.12 diameter cylindrical zone relative to the specified datums. That is why 0.12 is the correct tolerance zone value. The other numbers would correspond to different allowances or different tolerance types and don’t meet this described requirement.

The tolerance zone value is the size of the permissible deviation region for the geometric characteristic. In GD&T, when you see a position tolerance with a diameter symbol, it creates a cylindrical tolerance zone around the true position. The axis of the feature must lie within that cylinder, whose diameter equals the tolerance value specified. For this described feature, that cylinder has a diameter of 0.12, so the hole’s axis must stay within a 0.12 diameter cylindrical zone relative to the specified datums. That is why 0.12 is the correct tolerance zone value. The other numbers would correspond to different allowances or different tolerance types and don’t meet this described requirement.