Some physical and mechanical properties of sunflower heads and the corresponding seeds were measured.. These properties were considered to be as the database necessary for the proper design of equipment for sequence threshing and chopping processes of sunflower crop heads. Seed length, seed width, seed thickness and unit mass of the seed at moisture content of 16.1% d.b ranging from 10.75 to 12.25 mm, 6.08 to 7.85 mm, 3.49 to 4.60 mm and 0.11 to 0.14 g, respectively. For heads diameter,   thickness middle of head, thickness tip of head and unit mass at moisture content of 21.4% d.b ranged from 160 to 220 mm, 63.2 to 74 .0 mm, 26.8 to 40.0 mm and 235.12 to 422.18 g. For seed and head, friction increased with moisture content against galvanized metal sheet. It was also observed that the coefficient of friction for head was lower than that of seed against galvanized sheet metal. The angle of repose increased from 34.99 to 39.34º within the moisture content range of 10.2%~16.1% d.b. In general, physical properties of sunflower heads and the corresponding seeds were dependent on moisture content, and appear to be important in the design of post machinery equipments for threshing and chopping the crop stalks after threshing.