Bushed Roller Chain Sprocket For Bushing Size 2012 For Bushing Type Split Taper For Chain Pitch 3/4 in Material Steel Number of Teeth 21 Outside Diameter 5.426 in Pitch Diameter 5.032 in Chain Number 60 For Number of Strands Single Maximum Bore Diameter 2 in Finish Black Oxide Hub Diameter 3 5/8 in Hub Projection 0.791 in Hub Type One Side Length through Bore 1 1/4 in Standards ANSI B29.1 BIS Teeth Heat Treatment Hardened Teeth Tooth Width 0.459 in