Starch is one of the food sources extracted from cereals, roots, tubers, and stems. Sago palm (Metroxylon spp.) is one example of a starch source. The efficiency of the starch extraction process depends on the mechanical properties of the process material. A study was conducted to determine the angle of repose between the grated sago and the coefficient of kinetic friction between the sago trunk and stainless steel surface. The angle of repose (θ) of the 100 g grated sago was determined using the free flow method. The coefficient of kinetic friction between the sago trunk and stainless steel surface was determined using the pulling method at a speed of 1.27 mm/min, connected to force gauges. Both assessments were repeated at the different moisture content (MC) of 60%, 50%, 40%, and 30% of sago trunk. Based on the experimental results, the angle of repose (AoR= 47.000±0.31) and coefficient of kinetic friction (μ k) 0.88±0.005 at MC= 60% showed decrease in value (AoR= 43.610±0.34; μ k = 0.83±0.002) when the MC decrease to 30% (p<0.01).