Rockwell Hardness of Precision Balls

Listed below is the rockwell hardness of different precision ball types.


Rockwell Hardness

Chrome Steel 52100 Rc 60-67

Corrosion Resisting Hardened Steel




Rc 58-65

Rc 52 min

Corrosion Resisting Unhardened Steel





Rc 25-39

Rc 25-39

Rc 25-39

Carbon Steel Rc 60 min
Aluminum 2017 Rb 54-72
Aluminum Bronze Rb 94-98
Brass Rb 75-87
Bronze Rb 75-98
Monel 400 Rb 85-95
K-Monel Rc 27 min
Tungsten Carbide Ra 84-91.5


Ball Grades

Corrosion Resistance of Precision Balls

Rockwell Hardness of Precision Balls

The information on this web site is intended for guidance only. Since we gathered technical data from various technical sources, the actual mechanical and physical properties will vary from one lot of material to the next. Therefore, we accept no liability for deficiencies or damages arising from the use of this data, and customers should determine the suitability of a material or product by conducting practical tests under realistic conditions.