1.high precision 2.good wear resistance 3.fine finish 4. ... DescriptionDetails Precision steel tube for shock absorber Out Diameter18mm-121mm(1/2'' - 16'')Thickness 2mm-18mm(Sch40-XXS)Lengthas buyer's ... GB/T3639, GB8162,GB8163, DIN2391 ASTM A519,A106 ,A179 A53,, EN10305-1,EN10305-4,DIN17175Grade 10#,20#,35#,45#,20cr,40Cr,20CrMo,16mn ...