Expansion of deep groove ball bearings single row of compensation is to prevent the bearing outer ring of high temperature and high-speed skidding under working conditions, compensation loop expansion plays a vital role. Therefore to the expansion of the compensation coil expansion coefficient of the material and carry out an analytical study to determine the material and reasonable formula. To ensure that when the bearings in the gas pressure to bear 60N/CM, 13000rpm speed and high temperature conditions with the outer shell does not skid.