Track rollers (also known as cam followers) are characterized by their thick walled outer rings that run directly on a track. The thick outer rings permit high load-carrying capability while minimizing both distortion and bending stresses. Sealed designs with internal thrust washers help extend service life under conditions of infrequent lubrication. Koyo Yoke Track Roller, Crowned OD, Series: NA22, 20 mm Bore, 47 mm Roller Diameter, 17.8 mm Roller Width, 18 mm Overall Width, 16.7 kN Load, Double Seal Closure, 5900 RPM Grease Maximum, -25 to 225 °F, Steel Roller