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