The paper presents a relation between mechanical strength, length, diameter and pellets fractures and their soaking heat. The researched pellets were produced of pine tree sawdust in the pelleting machine matrix of 6- mm diameter openings. The research consisted in soaking pellets in the temperature from 20 to 70°C with a jump every 10°C. The maximum value of the average mechanical strength (97.59%) was obtained in the temperature of 30°C while the average minimum value (96.99%) was obtained by pellets fired in the temperature of 70°C. Statistical analysis which was carried out did not prove statistically significant impact of soaking temperature of pellets on the results of mechanical strength and their diameters. Statistically significant impact was reported for relations between soaking heat and the length and density of pellets.