Belt Pulley 1).Type: SPA, SPB, SPC,SPZ, AK,BK... 2).Material:cast iron ,steel 3).Thickness:5mm 4).Out Diameter:142mm Belt pulleyFeature ... sprockets and machinery transmission parts.Main products include sprockets, timing belt pulleys, gears & racks, bushes & hubs, pulleys, and others. Our factory ... ability to make special items according to customer's request. Belt pulley