... V-belts V-beltpulley specifications:1) European standard: a) V-belt pulleys for taper bushings: SPZ, SPA, SPB, SPC; up to 10 ... and variable speed pulleys c) Flat belt pulleys and conveyor belt pulleys2) American standard: a) Sheaves for taper bushings: 3V, 5V, 8V ... AT5, AT10, AT202) Pilot bore, taper bore and QD bore3) Materials: 1045 steel, aluminum and stainless steel4) Surface finish: black oxidized ...