SJZS 65/132 plastic extruder conical double screw barrel 1.Materials:38CrMoAIA,42CrMo,SKD61 2.Application:PVC, ... : Common Nitrided: approx 2 years Bimetallic : much longer lifetime Conical Double Screw Barrel Diameter 45/90-92/188mm Min. Order 1 ... set Materials 38CrMoAlA(JIS SACM645)42CrMo(JIS ACM440)SKD61 Discount Available ...