conical twin screw and barrel for extruder. it's a special design for extruder, based on 38CrMoAlA, large output conical twin screw and barrel for plastic extruder ... , 55/110, 60/125, 80/143, 80/156, 92/188, 95/188Material: 38CrMoAlA high quality alloy steelTechnology: nitriding ... customers)L/D ratio of screw: 16-35Conical dual-hole barrel screw specificaiton: Φ25Φ45-Φ92Φ188(according to the ...