Which element is NOT part of a standard feature control frame?

Which element is NOT part of a standard feature control frame?

• A. Material specification
• B. Geometric characteristic symbol
• C. Tolerance value/modifier
• D. Datum references

Answer: (A)

In a standard feature control frame, the focus is on how a feature must meet geometric constraints in relation to datums. The frame begins with the geometric characteristic symbol that identifies what is being controlled (for example, position, perpendicularity, or flatness). Then comes the tolerance value, often with a modifier such as MMC or a projected tolerance zone, which specifies how much variation is allowed. Finally, one or more datum references indicate which datums these constraints relate to. Material specification, such as the type of material or its properties, isn’t part of the feature control frame; those details belong in notes or the title block because they don’t define geometric variation.

In a standard feature control frame, the focus is on how a feature must meet geometric constraints in relation to datums. The frame begins with the geometric characteristic symbol that identifies what is being controlled (for example, position, perpendicularity, or flatness). Then comes the tolerance value, often with a modifier such as MMC or a projected tolerance zone, which specifies how much variation is allowed. Finally, one or more datum references indicate which datums these constraints relate to. Material specification, such as the type of material or its properties, isn’t part of the feature control frame; those details belong in notes or the title block because they don’t define geometric variation.