... .Material: stainless steel, SS2172,ST52 3.Piston guage:M75*2 Hydraulic Cylinder Piston Parts Details: 1). Piston parts are used in hydraulic cylinder ... on.2). All seals are manufactured to US specification.3). Piston Finish: Fe/Zn Bright chromating min 25μ ,Thermal treated, rust ... 65-45.12, ASTM 8620, ASTM 8630, ASTM A148 grade 90-60, ASTM A216 70-36 grade WCB, C1018, C1020, C1045 ...