... grooves b) Adjustable speed V-belt pulleys and variable speed pulleys c) Flat belt pulleys and conveyor belt pulleys2) American standard: a) ... are also availableBelt Pulley 2) Idlers are tensioning systems for belt drives and return units; different types of idlers suitable for different ... simplex, duplex, triplex and plate-wheel sprockets are available V-Belt Pulleys SPZ/8, SPA/1, SPA/2, SPA/3, SPA ...