Astm a519 honed seamless steel tube for hydraulic cylinder Standard: astm a519 Materials: 1020, 1035, 1045, 4130, 4140 Technical: cold-drawn seamless Delivery condition: bk.Bkw, bk+s, gbk, nbk Straightness: 0.5mm/1m max for tubes below 3m, 0.8mm/1m max for tubes between 3 to 6m, 1.2mm/1m for tubes above 6m Technology: honed & srb (skived and roller burnished). Application: used in the hydraulic cylinder of the heavy machinery, cranes, excavator and forklifts.Etc
