1.material:ck45,st52,20MnV6,42CrMo4,40Cr 2.ground and chrome plated 3.advanced inspection apparatus 4.ISO9001:2008 Detailed DescriptionOur company specialized in hydraulic piston rod, cylinder rod ,long small diameter axes, hollow bar ,induction hardened rod.All technical parameters of our products comply with even superior tp state standards.Our products can be directly used in oil cylinder and ...