Nonmetallic Bearings offer an innovative solution to design problems that may involve lubrication, heat, cold, friction, wear and corrosion difficulties. With maximum usable temperature of 550F (288C), these Bearings are highly reliable and efficient. RULON(R) J is a patented all-polymeric reinforced PTFE compound that operates satisfactorily against soft mating surfaces, including stainless, aluminum, mild steel and many plastics. Item Diameter Tolerance is -0/+.003 inches. Bore Diameter Tolerance is -0/+.005 inches.