Sprocket For Bushing Size Q1 For Bushing Type Split Taper For Chain Pitch 1/2 in Material Steel Number of Teeth 70 Outside Diameter 11.433 in Pitch Diameter 11.145 in Chain Number 40 For Number of Strands Single Finish Black Oxide Hub Diameter 4 1/2 in Hub Projection 1.466 in Hub Type One Side Length through Bore 1 3/4 in Material Grade 1045 Resistance Properties Corrosion Resistant Teeth Heat Treatment Not Hardened Tooth Width 0.284 in Width with Bushing 2.503 in