Why is surface finish important in hydraulic tube selection?

 Surface finish matters in hydraulic tube selection because the internal bore's smoothness directly determines seal life, contamination control, and long-term system reliability—a rough or inconsistent finish accelerates wear on dynamic seals, promotes turbulent flow and cavitation, traps particulate contamination in microscopic peaks and valleys, and shortens the fatigue life of the tube itself under repeated pressure cycling. Hydraulic tubing looks like a simple, passive component—a conduit that just moves fluid from one point to another. But inside a system running at 3,000, 5,000, or even 10,000 psi, with fluid cycling thousands of times per hour, the internal surface of that tube is doing far more work than it appears. Surface finish: 

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