Cobalt 2 Balls

Cobalt is used in applications requiring extreme wear and temperature particularly where lubrication is marginal. Cobalt is highly resistant to corrosion. Please note that larger Cobalt alloy balls (1.5” and up) will have a lower hardness than smaller balls.


Material Analysis

Carbon 2.2/2.7%
Manganese 1.00% max.
Silicon 1.00% max.
Tungsten 16/19%
Chromium 31/34%
Iron 3.00% max.
Nickel 2.50% max.
Other 2.00% max.
Molybdenum ———–
Beryllium ———–
Cobalt Balance


Mechanical Properties

Tensile strength 40 Kpsi
Yield strength 60 Kpsi
Elongation Nil
Rockwell Hardness Rc 55-59 min.
Density 0.317 lbs/cubic inch


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.