The planned difference between a hole and the shaft for a running fit is called?

The planned difference between a hole and the shaft for a running fit is called?

• A. Tolerance
• B. Clearance
• C. Interference
• D. Oversize

Answer: (B)

Clearance is the intentional space between the hole and the shaft that allows motion. In a running fit, the hole is made larger than the shaft so parts can slide with little resistance, so the actual gap that remains when assembled is a positive value called clearance. This is set by the tolerances on both parts, but the term itself describes the resulting gap, not just the allowable variation of each part. If the hole were smaller or the shaft larger, you’d get an interference fit, where parts press together rather than slide. Oversize isn’t the term used for the planned difference in a running fit. A quick way to think about it: clearance equals the hole diameter minus the shaft diameter, and for a running fit this difference stays positive across the size ranges defined by the tolerances.

Clearance is the intentional space between the hole and the shaft that allows motion. In a running fit, the hole is made larger than the shaft so parts can slide with little resistance, so the actual gap that remains when assembled is a positive value called clearance. This is set by the tolerances on both parts, but the term itself describes the resulting gap, not just the allowable variation of each part. If the hole were smaller or the shaft larger, you’d get an interference fit, where parts press together rather than slide. Oversize isn’t the term used for the planned difference in a running fit. A quick way to think about it: clearance equals the hole diameter minus the shaft diameter, and for a running fit this difference stays positive across the size ranges defined by the tolerances.