... /105, 55/110, 55/120, 58/124, 60/125, 65/120, 65/132, 68/143, 70/135, 70/140, 75/150, 80/143 ... .5-0.8 mmHardness of Nitrided Layer: 900-1020Hv (HRC56°-65°)Hard Chrome Plating treatment:Thickness of Hard Chrome Plating Layer ... box14.screw barrel for blowing molding machine 1, Conical twin screw extruder is special equipment for all kinds of PVC powder extruder;2, The conical double screw ...