Condensation experiments have been performed over a mass flux range of 75-450 kg m(-2) s(-1) in an 8.91 mm inside diameter, axially grooved, micro-fin tube with R134a. At 75 kg m(-2) s(-1), the axially grooved tube performs marginally better than a smooth tube, but worse than a similarly grooved tube with an 18 degrees helix angle. Mass fluxes at 150 kg m(-2) s(-1) and greater show broad quality ranges in which the axially grooved tube performs significantly better than both smooth and helically grooved tubes. Pressure drop characteristics of the axially grooved tube are similar to those found in an 18 degrees helix angle tube.