Vertical Roller Mill Hydraulic System Minig Machine. How hydraulics work in vertical roller mill vertical roller mill hydraulic system of the proper use and vertical roller mill hydraulic system of the proper use vertical roller mill vertical roller mill wear parts and 2015714 vertical roller mill overview. Details.Vertical Roller Mill Cylinder Bore420 Rod210xStroke460 Working Pressure 250bar Tube Material CK45 End Cap c w Rear Clevis material 27SiMn single forging piece Rod Material 42CrMo4 single forging piece Rod Coating Chrome plating thickness 50microns Seals Brand Hallite Bearing Brand LYC All screw bolts are grade 12.9.