... extruder. dia25-133mm,Kinds of single key, head Spline, Hexagon, Involute Spline ect. Segment barrel for the twin compounding extruder. ... Φ25-Φ133mmKinds of single key, head Spline, Hexagon, Involute Spline ect.,The building block screw consists of ... material 38CrMoAlA, Welded inlay on the flight, prolong life of screw. Easy wearing parts of barrel feed inlet made from ...