Belt Pulley 1.V-belts: SPZ, SPA, SPB, SPC; A, B, C, Z 2.Material: cast iron, ... fast offer Belt Pulley's feature:1. European standard: a. V-belt pulleys for taper bushings: SPZ, SPA, SPB, ... SPC; up to 10 grooves b. Adjustable speed V-belt pulleys and variable speed pulleys c. Flat belt ... pulleys and conveyor belt pulleys 2. American standard:a. Sheaves for taper bushings/QD bushings/ split taper ...