... steel 38CrMoAlA by special treatment. Assembled together, they will become twin screw which are essential and key part of extruders for material ... , SLIDING PIECE3) MATADORFP 34WEAR CONE , BARREL , WEAR BARREL WEAR BUSH , WORM4) BUHLERDFEB315WORM , INLET SCREW , STOP BOLTDFEA220WORM , INLET SCREW , STOP BOLT , INSERT BUSHSPACER RING , MATRIZE ...