Transition Fit

Behind every smooth-running machine lies a language that most operators never see—the silent, precise language of shaft and hole tolerances. Every rotating shaft, every reciprocating piston, and every bushing that supports them speaks this language. When the tolerances are right, the conversation is seamless. When they‘re wrong, the results range from excessive friction to catastrophic seizure.

For engineers responsible for plain bearings and bushings—the unsung workhorses of heavy machinery—understanding tolerance of fit isn’t just a design exercise. It’s the difference between a component that outlasts the equipment and one that fails before its first scheduled maintenance.