This guide helps maintenance planners and OEM buyers turn a worn drive, partial part number or field measurement into a clear request for roller chain sprockets, sheaves, bushings or conveyor chain.
For roller chain drives, identify chain pitch, strand count and roller diameter before selecting tooth count. If the request is for a belt drive, collect belt section, current sheave diameters, center distance and target speed ratio. A photo of the existing drive helps, but measurement data is more useful than a picture alone.
Bore diameter, keyway size, set screw position and hub clearance decide whether a standard bore, finished bore, taper-lock bushing or split-taper arrangement makes sense. If a shaft cannot be removed, note the available radial clearance and guard access so a split sprocket can be considered honestly.
RPM, service factor, shock load, starts per hour, lubrication and temperature change the practical recommendation. A light packaging conveyor and an aggregate feeder may use similar visible parts but demand different assumptions about wear, access and replacement planning.
A clean packet includes part family, dimensions, application notes, required certificates, target shipment date and whether a distributor should handle the commercial order. This lets a spec engineer or channel partner respond with fewer clarification loops.
Use a ruler or caliper in the photo, capture both faces of the sprocket, and include the shaft bore. If the chain remains installed, show a short run of chain and the drive center distance. For sheaves, capture belt section markings if they are still legible.
Share what you know. Missing items can be clarified before the quote is finalized.