The function of bearing depends on its material's function. FAG generally uses low-alloy, high-purity chrome steel for the axle bearing lasso and the rolling part.

In recent years, the quality of iron is developing with its pricing rising, the bearings of FAG is also improving. Researches improve that its bearings can reach high intensity in good conditions.

FAG bearing can keep stable scale with 150 degree. If axle bearing is used in amyctic environment, bearing steel is also required to be able to bear corrode. Axle bearings of stainless steel add prefix "S" and suffix "W203B" in code name. In order to keep its ability to stand corrode, it's the outside can not be harmed in the process of installation and usage.

Nitriding silicon ball made by FAG is used for ceramics chief axis axle bearing. Ceramics ball steel ball is comparatively lighter than steel ball, and can roll quickly with long life time in low running temperature.