How are the adjustments shown in Unilateral Tolerance indicated?

• A. Through brackets and codes
• B. With positive and negative signs
• C. By using fractions
• D. Through underlining and bolding

Answer: (B)

Unilateral tolerance is indicated by using positive and negative signs, which specify the allowable variation in one direction from a nominal dimension. In this system, the tolerance is only applied in one direction, either above or below the nominal size.

For example, if a dimension is given as 10.0 mm ± 0.2 mm, it implies a unilateral tolerance where the dimension can range from 9.8 mm to 10.0 mm (in this case, the variation is only downward). This clear notation allows for precise control over dimensions, making it clear to the manufacturers how much larger or smaller a part can be made while still being acceptable.

Using positive and negative signs provides the necessary clarity on the allowable limits—crucial for ensuring parts fit together correctly in assembly or function effectively in their applications.