Sprocket For Bushing Size H1 For Bushing Type Split Taper For Chain Pitch 1/2 in Material Steel Number of Teeth 19 Outside Diameter 3.296 in Pitch Diameter 3.038 in Chain Number 40 For Number of Strands Single Finish Black Oxide Hub Diameter 2 1/2 in Hub Projection 0.591 in Hub Type One Side Length through Bore 7/8 in Material Grade 1045 Resistance Properties Corrosion Resistant Teeth Heat Treatment Hardened Teeth Tooth Width 0.284 in Width with Bushing 1.315 in