R” Hubs - For Assembly With “AR” Plate Sprockets
Round bore hubs have standard keyway and 2 setscrews. Sq ., Hex and Splined bore hubs have set screws only.
Ready Sprockets are a variety of sprockets and hubs drilled and tapped for basic, convenient assembly with standard hex head cap screws. For No. 
35 through No. 100 Chain, with stock completed bore hubs to accommodate shaft sizes through 2-3/4″ diameter, plus a variety of READY SPROCKET HUB - TYPE R square, hex, spline, and tapered crucial bores.