Bushed Roller Chain Sprocket For Bushing Size 1610 For Bushing Type Split Taper For Chain Pitch 5/8 in Material Steel Number of Teeth 21 Outside Diameter 4.522 in Pitch Diameter 4.194 in Chain Number 50-2 For Number of Strands Double Maximum Bore Diameter 2 in Finish Black Oxide Hub Diameter 3 1/2 in Hub Projection 0.205 in Hub Type One Side Length through Bore 1 1/4 in Standards ANSI B29.1 BIS Teeth Heat Treatment Hardened Teeth Tooth Width 0.332 in