Which of the following is a metallic liner material used for bearings?

Brass is a commonly used metallic liner material in bearings due to its excellent wear resistance and durability. It has good load-bearing properties, which makes it suitable for various applications where friction needs to be minimized while ensuring strength. Brass also has favorable properties such as corrosion resistance, ease of machining, and the ability to conduct heat, which makes it beneficial in bearing applications where temperature management is important.

Materials like nylon, polyurethane, and phenol laminate are alternatives used in different contexts but are primarily non-metallic. They can offer other benefits, such as lightweight, corrosion resistance, and vibration dampening, but they do not possess the same load-bearing characteristics as brass. These other materials are better suited for applications where lower loads are encountered or where electrical insulation and specific chemical resistances are required.