Single Strand Sprocket For Bushing Size 2517 For Bushing Type Taper Lock For Chain Pitch 3/4 in Material Steel Number of Teeth 72 Outside Diameter 17.628 in Pitch Diameter 17.194 in Chain Number 60 For Number of Strands Single Maximum Bore Diameter 2 1/2 in Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 4 1/4 in Hub Projection 1.291 in Hub Type One Side Length through Bore 1 3/4 in Material Grade 1045 Minimum Bore Diameter 2 1/2 in