1.hydraulic pipe 2.good mechanical properties 3.percentage elongation and the strength are ideal 4.NBK 5.NDT Hydraulic pipethe manufacturing standard adopted ... during the use .therefor it is the ideal tube for hydraulic system and mechannical structure device.specification: Outside Diameter:4-114mm ... ,200,210,213,333,335,500,519,556,587) ,etc. hydraulic pipe