Instead, with tapered roller bearings, the internal clearance is defined by an axial clearance or Bench End Play – BEP. For two and four row tapered roller bearings of all sizes, it is very difficult to measure clearance in a radial direction, and is generally not done. IRC is the total movement however, this method does not lend itself to large, heavy industrial bearings. On small cylindrical roller and ball bearings, it can be easily measured with a dial indicator gage by laying the bearing on one side, fixing one race, and pushing the other race one direction and pulling back 180º. size of the inner race roller path or ball groove. two times the rolling element diameter and the O.D. Its numerical value can be calculated by subtracting from the diameter of the outer race roller path or ball groove I.D. ![]() This is the total clearance inside a bearing in the radial direction. With radial bearings of the deep groove ball, cylindrical roller and spherical roller types, the term Internal Radial Clearance - IRC - is commonly employed. ![]() Internal Radial Clearance of ball and roller bearings is an important parameter in obtaining proper machine operation, optimal bearing life, and a reasonable operating temperature.
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