hydro cylinder:cylinder bottom ,OD:242,material:GB45# This is our new series ,and into production this year.we have equippment much new machines to do it ,such as :double face milling machine ,that cansure one face same as another .The details of it :1,Material :GB45#2, Hardness:26-28HRC3,OD:242,Length:3204,Suface finish:GB1.65,Package :wodden case6,Sample is available.our govenment websit:www. ...