Which term describes the dimension or analysis needed to ensure proper fit in moving parts?

The correct term that describes the dimension or analysis needed to ensure proper fit in moving parts is clearance. Clearance refers to the space between two parts, allowing them to move without interference. It is crucial to ensure that moving components can operate smoothly without binding or excessive friction, which could lead to premature wear or failure.

For example, in an engine, the clearance between the piston and the cylinder wall must be carefully measured to allow for thermal expansion while preventing the piston from seizing. Proper clearance is vital for maintaining efficiency and longevity in mechanical systems.

Understanding clearance helps mechanics design and maintain systems where parts interact dynamically, ensuring they function correctly and safely. This concept is closely related to fit, which generally refers to how snugly two parts are designed to assemble, but clearance specifically highlights the necessary space for movement.