Star Ruby grapefruits were tested using a linear sliding friction test device connected to a Lloyd material testing machine, a data acquisition system and a personal computer. The tests were carried out with four replications per treatment combination under controlled variable parameters. Controlled variable parameters were sliding speed, abrasion surface and normal load. The peak static and average dynamic coefficients of friction against four abrasion surfaces (aluminum, plastic, corrugated cardboard and galvanized sheet) were measured at four sliding speeds (50, 100, 250 and 500 mm min(-1)) and three normal loads (20, 30 and 40 N). Analysis of variance (ANOVA) results showed that abrasion surface for both peak static and average dynamic, and normal load for only average dynamic coefficient of friction significantly affected the coefficient of friction, respectively. The effect of sliding speed on both coefficients of friction was not statistically significant. The coefficient of friction tended to increase or decrease depending on abrasion surface and normal load. The highest peak static and average dynamic coefficient of friction were found in the case of galvanized sheet by 500 mm min(-1) and galvanized sheet by 50 mm min(-1) combinations, respectively. The results of this study could be used for protecting products against abrasion damage.