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