1,NATR Yoke Type track roller with axial guidance by washers, gap seals, with inner ring; 2,NATR PP Yoke type trace rollers with additional sealing rings; 3,NATV Yoke Rollers with axial guidance by washers, full complement, gap seals, with inner ring; 4,NATV PP. Yoke type trace rollers with additional sealing rings; 5,NUTR Yoke type track rollers with axial guidance by the rolling elements, full complement, gap ,Seals with inner ring;