the thrust washer 12 so configured being called a flat thrust washer 12 the flat thrust washer 12 has a minimum inside diameter 32 equal to the shaft outside diameter 34 plus twice a diameter 36 of a needle roller 38 from the needle roller bearing 20 the flat thrust washer 12 has an outside diameter 40 less than an outside diameter of the gear 42 the flat thrust washer 12 is associated with a cylindrical recess 44 in each end 14 of the planet gear 12 the recesses 44 are not as deep as the flat thrust washers 12 are thick a surface 45 of the outside diameter 40 of the flat thrust washer 12 and an inside diameter surface 46 of the cylindrical recess 44 have a piloting relationship the surface 45 of the outside diameter 40 of the flat thrust washer 12 is the washer pilot outside diameter surface 22 the inside diameter surface 46 of the cylindrical recess 44 in the end 14 of the planet gear 10 is the washer pilot inside diameter surface 24 the second configuration of the thrust washer 13 called a cupped thrust washer 13 and shown in fig2 and fig3 has a cupped portion 50 projecting from an annular portion 52 at an inside diameter edge 54 of the annular portion 52 the cupped portion 50 is cylindrical in shape and is concentric with the annular portion 52 the cupped portion 50 has a cupped portion flange 56 projecting radially inward at an end 58 of the cupped portion 50 distal to the annular portion 52 the cupped portion flange 56 provides a minimum inside diameter 60 of the cupped thrust washer 13 the minimum inside diameter.