Idler Roller Chain Sprocket, Bore Diameter 5/8 in, Chain Number 50, Sprocket Material Steel, Number of Teeth 17, Outside Diameter 3.72 in, Bearing Type Ball, For Chain Pitch 5/8 in, For Number of Strands Single, Hub Diameter Not Applicable, Hub Projection Not Applicable, Length through Bore 23/32 in, Lubrication Multi-Temperature Quality Bearing Grease, Pitch Diameter 3.401 in, Sprocket Width 0.72 in, Standards ANSI, Teeth Heat Treatment Hardened Teeth.
eBay