What are general tolerances in dimensional specifications?

• A. Specific tolerances noted on drawings
• B. Tolerances assumed if no specifications are provided
• C. Tolerances applicable for only special materials
• D. Tolerances that exceed standard limits

Answer: (B)

General tolerances refer to the tolerances that are applied to dimensions in the absence of specific tolerances indicated on engineering drawings. These are standardized values that define acceptable variations in size and geometry for features of a manufactured part when no explicit tolerance is provided. This practice helps ensure consistency and helps manufacturers and quality control personnel understand the acceptable limits of variation for production without needing to reference detailed specifications for every individual feature.

Utilizing general tolerances streamlines the design and evaluation process, allowing for efficient communication of requirements. When designers specify general tolerances, it promotes a standard approach to tolerancing that can be easily interpreted and applied across various parts and assemblies.