Idler Sprocket Bore Diameter 1 in Number of Teeth 18 Outside Diameter 5.6 in Pitch 0.875 in Compatible Tightener Shaft Grainger Part Number 813Y51 Bearing Type Needle Roller Compatible Tightener Shaft Manufacturer Part Number N2 Face Width 2 in For Belt Series XH For Belt Trade Size XH For Belt Width 2 in Material Fabrication Cast Number of Flanges 2