... screw and barrel for plastic extruder, granulator or pelletizer Ruian Yumin machine screw co.,ltd is a factory specialized in making screw barrel, filter, mould, gearbox and recycling machine ... /188, 95/188Material: 38CrMoAlA high quality alloy steelTechnology: nitriding treatment, alloy coating spraying, heating treatment, screw fully hardeningDiameter: Φ45-Φ200(according to ...