Which statement defines profile of a line?

Which statement defines profile of a line?

• A. A tolerance that controls the allowable variation of the entire contour of a surface.
• B. A datum reference frame specification for lines.
• C. A tolerance that controls the boundary along a line.
• D. A measurement of thickness along a line.

Answer: (C)

Profile of a line defines how much the boundary along a line on the part may deviate from its true shape. The true profile is a line, and a tolerance zone is built around that line so the actual boundary must stay within that zone as you move along the line. This focuses on shaping the boundary specifically along that line, rather than controlling the entire surface contour. It’s not about a datum frame specification or thickness measurement, which makes the option describing a boundary along a line the best fit for the concept.

Profile of a line defines how much the boundary along a line on the part may deviate from its true shape. The true profile is a line, and a tolerance zone is built around that line so the actual boundary must stay within that zone as you move along the line. This focuses on shaping the boundary specifically along that line, rather than controlling the entire surface contour. It’s not about a datum frame specification or thickness measurement, which makes the option describing a boundary along a line the best fit for the concept.