What does an interference fit primarily rely on to maintain its connection?

An interference fit primarily relies on friction to maintain its connection between two parts. In an interference fit, the dimensions of the two mating components are designed so that one component (such as a shaft) is slightly larger than the other (such as a hole) into which it is inserted. This results in a tight fit that creates significant mechanical friction at the interface when the parts are joined.

The friction generated due to this tight fit ensures that the components remain securely connected, preventing them from slipping, loosening, or separating under load. This plays a crucial role in applications where part alignment and stability are critical, such as in machinery and structural supports.

In contrast, mechanical bonding relies on physical features or shapes that lock parts together, adhesive bonding uses a substance to adhere parts, and magnetic attraction depends on magnetic forces between materials. None of these mechanisms can provide the same level of stability through physical interference and friction as achieved in an interference fit.