1.1 This standard applies to a series of straight face and crowned face welded steel conveyor pulleys which have a continuous rim and two en discs each with a compression bype hub to provide a clamp fit on the shaft. It is not applicable to single disc pulleys, wing or slat type pulleys, cast pulleys or pulleys not utilizing compression type hubs.The standard establishes load ratings, allowable variation from nominal dimensions, permissible crown dimensions and such overall dimensions as are normally necessary to establish clearances for location of adjacent parts. It is not intended to specify construction details, other than as outlined above, nor to establish the actual dimensions of any component parts.The series of pulley sizes and shaft combinations shown in Table 3 and the load ratings shown in Table 2 cover the majority of combinations of welded steel pulleys with compression type hubs normally used in belt conveyor and elevator practice. Only the series shown are covered by this standard.1.2 Welded steel conveyor pulleys covered by this standard should not be used with steel cable and other high modulus belts because such belts create stress concentrations and demand manufacturing tolerances beyond the capacities of these pulleys.