Nilos-Ring Type LSTO steel-disk seals provide protection for grease-lubricated bearings exposed to extreme levels of contamination. Applications for these specialized bearing seals include lubrication and fluid power equipment; construction, mining, paper, and agriculture machinery; and conveyor rollers. They satisfy key performance requirements by minimizing bearing friction losses and heat build-up, and preventing lubricant leakage and penetration of dirt. The non-contact, grease-filled labyrinth sealing elements consist of laminated steel-seal disks and steel cores. The seals resist axial pressure and will not slip when clamped in the axial direction of both the inner and outer periphery of a roller-bearing ring.