LFR5207-30 NPP LFR5207-30-2RS locating bearing track rollers with Gothic arch groove.  Groove Diameter: 30 mm Inner Diameter: 30 mm Outer Diameter: 80 mm Inner Thickness: 27 mm Outer Thickness: 29 mm Weight: 0.66 kg Product Details   LFR5207-30 LFR5207-30NPP LFR5207-30-2RS 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.