Which tolerance relates to the table sag, stated as 2 mm?

• A. ±2 mm
• B. 1°
• C. 2 mm
• D. ±0.5 mm

Answer: (C)

Tolerances in this context are about how much a feature is allowed to deviate in a straight-line distance. When the sag of the table is stated as 2 mm, that means the only allowance is a maximum vertical drop of 2 millimeters from level, a single distance limit rather than a bidirectional range or an angle. That’s why the plain 2 mm best expresses the requirement: it defines the maximum vertical displacement directly. A bidirectional tolerance like ±2 mm would imply sag could go 2 mm up or down, which isn’t what's specified; an angular tolerance (1°) isn’t relevant to a linear sag; and a smaller bilateral tolerance such as ±0.5 mm would contradict the given 2 mm limit.