BURNISHED / HONED TUBES DETAIL Honed Tube is well known as hydraulic cylinder tube in industries.Honed Tubes/ Skived & Roller Burnished Tubes are the most important material of manufacturing hydraulic cylinders. • ST-52 MATERIAL: ST52/C20/P20• TOLERANCE INT: H8• TOLERANCE OD: DIN2391/EN10305-1• SURFACE ROUGHNESS 0.2Raor BETTER• STRAINGTHNESS:0.8/1000mm