Standard conveyor pulleys are fabricated from steel shells/plates with welded end plates and bosses keyed/fitted direct/through taper sleeve on the shaft. The distance over bosses can be made to suit any requirement however, we recommended that this be as wide as possible to keep the dimension between the boss and bearings to minimum to reduce shaft flexing. The diameters of pulleys selected for a given application depend on the specification of belt, which in turn depend on the power to be transmitted. We suggest to use adequate diameter of drum based on above factors and as recommended by belt manufacturers. Drive/Tall/ Take-up pulleys have machined crowned faces to train and reduce wear on belt. Other pulleys are with straight face. Plain or grooved rubber lagging can be furnished when additional friction is required between belt and pulley or if the application calls for the same such as handling wet/ abrasive materials etc.