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In the global design of an hydraulic jack or a shock absorber, the tribological problems lie on one hand in the definition of the surface of the piston rod in terms of hardness, scale of roughness and morphology, on another hand in the definition of adequate fluid, seals and guiding elements with respect to such surface, both definitions ensuring that the system will demonstrate the lowest possible level of fluid leakage, together with the lowest and most stable values of friction coefficient and wear rate. Abrasion and corrosion resistance being needed as well as tightness and smooth friction, two surface treatments are presently used: hard chromium plating (with ou without nickel underlayer depending on the corrosion resistance required), and oxynitrocarburizing.