What is an interference fit?

What is an interference fit?

• A. A fit where parts are pressed together and require force to assemble, creating a tight, permanent connection.
• B. A loose fit with clearance.
• C. A fit with matching thread sizes.
• D. A fit relying on adhesive.

Answer: (A)

Interference fit means the parts are sized so that assembly requires force because the mating parts overlap in size, creating a tight grip that is usually permanent. The surfaces press against each other, and friction holds the parts in place without fasteners. This is why you press them together, sometimes using heat or cooling to aid the fit. It’s different from a loose fit with clearance, where there’s space to slide easily; it’s not about threaded connections or bonding with adhesive, which are separate methods of assembling or joining parts.

Interference fit means the parts are sized so that assembly requires force because the mating parts overlap in size, creating a tight grip that is usually permanent. The surfaces press against each other, and friction holds the parts in place without fasteners. This is why you press them together, sometimes using heat or cooling to aid the fit. It’s different from a loose fit with clearance, where there’s space to slide easily; it’s not about threaded connections or bonding with adhesive, which are separate methods of assembling or joining parts.