The hard chrome surface of the tubes confers
corrosion and wear resistance, reduces friction,
improves durability and through abrasion
tolerance ensures good oil holding as well.
Replaces solid piston rods in systems where the total weight is to be minimized.
The hardening is made mainly for conferring a protection of the surface against mechanical strokes or blows (ex. mining equipment constantly stroked by pebbles and dust). The surface does not withstand a high, direct and continuous pressure (like ball bushing), but only seals.