No washer needed here…when using a bearing with cage and roller assembly, http://www.vxb.com/page/
bearings/PROD/Kit8683 a separate raceway washer is not needed if the gear side is used as a raceway. This saves space and allows the bearing to be even more compact. If the bearing is placed in a housing, that will not allow the gear side to be used as a raceway, using an integrated bearing facilitates handling and mounting. Thrust bearings are often used in automobile drive trains, compressors, hydraulic pumps, machine tools, and industrial machinery.