There are many type of bearing material such as Carbon steel ,Chrome steel ,Stainless steel and ceramic .How are choose a suitable bearing ,below here are different features for for your reference .

Carbon Steel Features :

Hardness: 50-55 degree

High material toughness

Low price ,speed  and high noise

General wear resistance

Chrome Steel Gcr15 Features :

Hardness 60-62 degree

High load capacity

Competitve price

With high speed low noise and high precision

Hihg  resistance

Stainless steel Features :

Rust and corrosion resistant

High quality and precision

Higher resistance

Strong load bearing capacity

There are 440 stainless steel and 304 stainless steel

ZZ BEARING can produce with different material ,for more informations ,pls contact with me directly .