Bushed Roller Chain Sprocket For Bushing Size 3020 For Bushing Type Split Taper For Chain Pitch 1 1/2 in Material Steel Number of Teeth 21 Outside Diameter 10.851 in Pitch Diameter 10.064 in Chain Number 120 For Number of Strands Single Maximum Bore Diameter 3 in Finish Black Oxide Hub Diameter 5 1/4 in Hub Projection 1.076 in Hub Type One Side Length through Bore 2 in Standards ANSI B29.1 BIS Teeth Heat Treatment Hardened Teeth Tooth Width 0.924 in