Formatting Tolerances
The following formatting rules are in accordance with the ASME Y14.5M standard.
Metric Tolerances
Standardized Fit Tables: Tolerances from standardized fit tables are listed on drawings as;
Unilateral tolerances: A single zero without a plus or minus sign.
Bilateral tolerances: Both the plus and minus values have the same number of decimal places.
Limit dimensions: Both values should have the same number of decimal places.
Basic dimensions with a tolerance: The number of decimal places in the basic dimension does not have to match the number of decimal places in the tolerance.
Inch Tolerances
Unilateral and Bilateral tolerances: The basic dimension and the plus and minus values should have the same number of decimal places.
Limit dimensions: Both values should have the same number of decimal places.
Basic dimensions with a tolerance: The number of decimal places in the basic dimension should match the number of decimal places in the tolerance.
Angular Tolerances
Both the angle and the plus and minus values have the same number of decimal places.
