Porduct Name: Extruder screw [back]
Diameter：Φ12-Φ500
Length-diameter ratio：L/d=15-40
Screw type：efficient, extrude-varied, gradually-varied, wavy type, barrier, double-screen, shunt type, separate type, exhaust, pin type, hybrid, two-headed, three-headed, multi-headed and pellet type.
Nitriding depth：0.5~0.8mm
Nitriding hardness：950~1020Hv
Nitriding brittleness：≤Grade II
Surface roughness：Ra0.4um
Screw straightness：0.015mm
Surface hard chrome plating hardness after nitriding：≥950Hv
Thickness of chromium coating：0.03~0.08mm