Which term describes a design that ensures a clearance always results when mating parts are assembled?

Which term describes a design that ensures a clearance always results when mating parts are assembled?

• A. Allowance
• B. Auxillary View
• C. Clearance Fit
• D. Interference

Answer: (C)

Understanding fits and tolerances: this item asks for the type that guarantees a clearance in every assembled case. A clearance fit means there is always some space between the two parts after they are put together. This happens when the hole is always larger than the shaft across all allowable manufacturing variations, so the minimum hole size is greater than the maximum shaft size. In practical terms, you can expect the parts to slide or move freely, which is ideal for things like pins, bushings, or sliding joints. The other terms don’t guarantee that space. An auxiliary view is just a drawing technique used to show features that aren’t visible in the standard views, not about how parts fit together. An interference fit is the opposite scenario, where parts overlap and must be pressed or heated to assemble, so there’s no guaranteed clearance. Allowance is the intentional difference between basic sizes, but depending on tolerances, the actual parts could end up with clearance or interference, so it doesn’t by itself ensure a clearance in every case.

Understanding fits and tolerances: this item asks for the type that guarantees a clearance in every assembled case. A clearance fit means there is always some space between the two parts after they are put together. This happens when the hole is always larger than the shaft across all allowable manufacturing variations, so the minimum hole size is greater than the maximum shaft size. In practical terms, you can expect the parts to slide or move freely, which is ideal for things like pins, bushings, or sliding joints.

The other terms don’t guarantee that space. An auxiliary view is just a drawing technique used to show features that aren’t visible in the standard views, not about how parts fit together. An interference fit is the opposite scenario, where parts overlap and must be pressed or heated to assemble, so there’s no guaranteed clearance. Allowance is the intentional difference between basic sizes, but depending on tolerances, the actual parts could end up with clearance or interference, so it doesn’t by itself ensure a clearance in every case.