LFR5301-20 KDD LFR5301-20-2Z locating bearing track rollers with Gothic arch groove.  Groove Diameter: 20 mm Inner Diameter: 12 mm Outer Diameter: 42 mm Inner Thickness: 19 mm Outer Thickness: 19 mm Weight: 0.13 kg   Product Details LFR5301-20 LFR5301-20KDD LFR5301-20-2Z locating bearing track rollers with Gothic arch groove.  •  There are two contact points between the roller and track, so the contact function is favorable. •  Rollers feature double row angular contact ball bearing in its internal structure design and a thick-walled outer ring, so rollers can accommodate higher loads. •  Rollers are made of high-quality bearing steel, processed by heat treatment and precision grind, and are filled with a long service life, high-grade and multi-purposes grease. Rollers mount the metal shield (KDD/2Z) or rubble seal (NPP/2RS) to prevent the dust. Some types of the rollers can be made from the corrosion resistance stainless steel 440C.