Coefficient of friction is one of the most quietly important values in mechanical design, and it directly determines how fastener torque translates into clamp load, how much force it takes to actuate a latch or switch, and how quickly a sliding interface wears over time. This glossary entry explains what the coefficient of friction actually measures, why it depends on the surface pair and condition rather than a single material, and why the same fastener behaves completely differently dry versus

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