What are the materials of bearings

Category: Technical Articles

Time: 2026-04-25

Summary: Bearing steel: such as GCr15 and SAE 52100, with high hardness and wear resistance, is the most commonly used material for rolling bearings.

Metal and alloy materials

Bearing steel: such as GCr15 and SAE 52100, with high hardness and wear resistance, is the most commonly used material for rolling bearings.

Stainless steel: such as 440C, 304, 316, with strong corrosion resistance, suitable for humid or corrosive environments such as food, medical, and chemical industries.

Sliding bearing alloys: including Babbitt alloys (tin based, lead based), copper based alloys (bronze), and cast iron, commonly used in low-speed heavy-duty or medium speed high-temperature working conditions.

Non metallic and ceramic materials

Engineering plastics: such as nylon PTFE、POM， It has the characteristics of self-lubricating, corrosion-resistant, and lightweight, suitable for oil-free lubrication or food machinery.

Ceramics: such as silicon nitride, zirconia, silicon carbide, high temperature resistance, insulation, high speed, and have a lifespan 3-5 times longer than steel bearings.

Carbon graphite: resistant to high temperatures, usually supported by steel sleeves, commonly used in special high-temperature environments.

Porous metal materials

Oil containing bearings: made by sintering metal powder, with oil containing internal pores and self-lubricating properties, suitable for medium and low-speed applications where frequent refueling is inconvenient.

Keywords: What are the materials of bearings

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