A mechanical fastening achieved when a component is deliberately manufactured with dimensions slightly larger than the corresponding hole or receiving feature into which it is intended to be inserted. The subsequent assembly process, typically involving force or temperature manipulation, creates a tight, secure connection. An example occurs when a shaft slightly exceeding the diameter of a bearing’s inner race is pressed into place; the resulting compressive forces generate a high-strength, immobile union.
This technique provides significant advantages in applications requiring high torque transmission, resistance to loosening under vibration, and precise alignment. Its inherent strength and durability have made it a cornerstone of engineering design across numerous industries, evolving from traditional methods to sophisticated processes utilizing advanced materials and controlled environmental conditions for optimized performance.