Idler Roller Chain Sprocket Bore Diameter 5/8 in Chain Number 40 Sprocket Material Steel Number of Teeth 17 Outside Diameter 2.98 in Bearing Type Ball For Number of Strands Single Length through Bore 23/32 in Lubrication Multi-Temperature Quality Bearing Grease Pitch Diameter 2.721 in Sprocket Width 0.72 in Standards ANSI Teeth Heat Treatment Hardened Teeth