... e) Conveyor belt pulleys f) Conveyor idlers g) Taper lock pulleys h) Timing pulleys i) Sheave2) V- ... 1) European standard: a) V-belt pulleys for taper bushes: SPZ, SPA, SPB, SPC; up to 10 ... and conveyor belt pulleys2) American standard: a) Sheaves for taper bushes: 3V, 5V, 8V b) Sheaves for QD ... T20, AT2.5,AT5, AT10, AT202) Pilot bore, taper bore and QD bore3) Materials: 1045 steel, aluminum and ...