What feature is employed to lock a specific dimension when modifying other dimensions in the model?

The feature that locks a specific dimension when modifying other dimensions is a dimension constraint. This type of constraint allows certain dimensions in a model to maintain a fixed relationship, enabling other dimensions to change while ensuring that the specified dimension remains unchanged. This is crucial for maintaining design intent and ensuring that critical measurements stay consistent, which is especially valuable in complex assemblies or parts.

Using dimension constraints helps in maintaining an overall control over the model, allowing designers to experiment with variations in dimensions while protecting key measurements. This flexibility is essential for making design adjustments without compromising the integrity of critical dimensions that are integral to the functionality or fit of a part within an assembly.

While the lock icon might suggest a way of visualizing or applying constraints, it is not the fundamental feature responsible for locking dimensions in modeling contexts. Similarly, the terms "fixed dimension" or "dimension tag" do not accurately capture the concept of maintaining the relationship between various dimensions.