En 10305-1 honed seamless steel tube for hydraulic cylinder Standard: en 10305-1, en 10305-4 Materials:e215, e235, e255, e355, c35e, c45e, 25crmo4, 42crmo4 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
