The bearing lubricant (513 SUS at 100◦F) operating point is 135◦F. A countershaft is supported by two tapered roller bearings using an indirect mounting. The radial bearing loads are 560 lbf for the left-hand bearing and 1095 for the right-hand bearing. The shaft rotates at 400 rev/min and is to have a desired life of 40 kh. Use an application factor of 1.4 and a combined reliability goal of 0.90. Using an initial K = 1.5, find the required radial rating for each bearing. Select the bearings from Fig. 11–15.