What is an interference fit?

An interference fit refers to a condition where two components are intentionally designed to have a tight fit when assembled, often creating a strong mechanical bond without the need for adhesives or welding. This fit occurs when the dimensions of the parts are engineered such that one part is larger than the other, leading to a significant contact pressure when they are pressed together. This method leverages the mechanical force generated by the interference to ensure a secure connection, making it especially useful in applications where a high level of strength is required, such as in machine parts, shafts and bearings.

In contrast, the other options describe different joining methods that do not involve the specifics of an interference fit. The first option relates to threaded joints, while adhesive bonding and welding describe processes that rely on different chemical or thermal interactions to achieve a strong connection. These processes do not embody the concept of an interference fit, which is fundamentally about the physical dimensions and mechanical force at play in the joining of two components.