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Description:We mainly produce the Honed tubes, Rods, Hydraulic Components and Systems, and the following is the technical standard we commonly use. Honed tube Grade: ST 52.3 BK +S Metric size: O.D: 20 to 700mm Max length 12m Straightness: 0.3 -1.0/1000 Tolerance EXT: DIN 2391 Tolerance INT: ISO H8 to H9 Roughness(Ra): 0.2 to 0.8 Tensile strength:> 60kgf/mm2 Yield Point:> 52kgf/mm2 Elongation:> 14% Chrome rod Grade: CK45 O.D.: from 6 to 150mm. Roughness: 0.4 HR > HRC 60 Roundness< 0.01 Straightness< 0.15/1000 The thickness of plate chrome: 0.02-0.05mm(can plating two times) Hydraulic Components and Systems Produce with the customer's drawing and require.