extruder,extrusion,extruding, single screw and barrel 1for various extruding machines 2 38CrMoA1A 3PTA, ion nitride,and more Specifications of this single screw and barrel:diameter: Φ15mm~ Φ250mmlength:300mm~8000mmexternal diameter:Φ40mm~Φ400mmL/D: 10~46 Technical indexes:38CrMoALA, Nitriding hardness:HV850~1000, Nitriding depth:0.5~0.8mm, surface roughness:Ra0.4um, screw straightness:0.015mm, ...