Espresso grind
Espresso normally uses finely ground coffee to create enough resistance for pressurised water to flow through a compact coffee bed at a controlled rate.
Why so fine?
A fine grind provides high surface area and resistance to water flow. Espresso recipes use pressure and a compact coffee bed, so grind size has a major effect on flow and extraction.
Dialling in
Espresso grind adjustment is recipe-dependent. Dose, yield, time, machine characteristics and coffee all interact, so “espresso fine” should be treated as a starting range rather than a universal setting.
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Accuracy note: Coffee terminology and recommended brewing parameters can vary by producer, roaster, equipment and recipe. Where a term is not universally standardised, this site says so rather than presenting one convention as a rule.