... on 38CrMoAlA, large output conical twin screw and barrel for plastic extruder Ruian Yumin machine screw co.,ltd is a factory ... and ability to give the best product with excellent quality for our customers.size: 35/75, 45/90, ... 188, 95/188Material: 38CrMoAlA high quality alloy steelTechnology: nitriding treatment, alloy coating spraying, heating treatment, screw fully hardeningDiameter: Φ45-Φ200( ...