hydraulic cylinders 1.ISO 9001 ,I 2.Strict QC 3.Standard:ASTM,AISI,BS,DIN,JIS,NF 4.OEM serc hydraulic cylinders Technology:precision casting/investment ... machinery parts, metallurgy tools, shipping parts, etc. Quality control system:ISO 9001:2008. inner control. 100% inspection for parts.Advanced test ... excellent surface treatment;All order dispatched promptly Small orders accepted hydraulic cylinders