Stainless Steel Piston Head 1.Used for hydraulic cylinder 2.Material: stainless steel, SS2172,ST52 3.Piston guage:M75*2 Hydraulic ... with CNC milling and turning machines, CNC Lathes, etc. 3. Quality Certificates: ISO9001-2000, ISO9001-2008 Quality Assurance System, ... parts, engineering goods, etc. 5. Quality control following 3 phases of thorough inspection, first-off inspection, during-processing ...