Physical properties often required for developing the machines for cleaning of grain. Physical properties of wheat varieties (Sakha93) were determined and compared for moisture content 9, 11, 13 and 15% w.b. The average length, width and thickness were 7.46, 3.37 and 2.66 mm at a moisture content of 9% w.b., respectively. Studies on wheat grain showed that the thousand-kernel mass increased from 48.596 to 55.206g when the moisture content increased from 9 to 15%. The geometric, equivalent and arithmetic mean diameter at a moisture content of 9% were 4.06, 4.08 and 4.5mm. The average mass of one grain, volume and surface area were 0.048g, 35.49 mm³ and 43.87 mm². Area of flat and transverse surface was 19.74 and 7.04 mm². Sphericity and index-k were 54.41% and 2.49. Bulk density decreased from 660 to 589.8 kg m^-3, when increasing the moisture content from 9 to 15% .True density decreased from 1244.6 to 1210.8 kg m^-3, when increasing the moisture content from 9 to 15%.Angle of repose varied from 16.8 to 21.6º when the moisture content increased from 9 to 15% .The static friction coefficient of wheat increased linearly against surfaces of four structural materials, namely, wood (0.379 – 0.399), galvanized iron (0.345 – 0.364), formica (0.306 – 0.344)  and glass (0.299 – 0.335) as the moisture content increased from 9 to 15%.