Precision Balls

Cobalt Alloy Balls (Alloy No.2)

General Information:
Cobalt Alloy Balls are used in bearings and valves where high retained hardness, abrasion resistance and corrosion resistance at elevated temperatures is important. Other cobalt base alloys are available to special order.
Basic Composition:
Nickel 2.5% Max.
Chromium 31/34%
Tungsten 16/19%
Iron 3% Max.
Carbon 2.2/2.8%
Silicon, Manganese, and others total 5.5% approx.
Cobalt Balance
Mechanical Properties:  
Hardness 52 Rockwell 'C' Min
Density 0.316lbs/
Specific Gravity 8.76 approx.
Size Range:  
Imperial 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", and 9/16"
Basic Dia.Tolerance ±.0001"
Sphericity .000025"
Surface Finish (AA) 1.5 micro-inch
Corrosion Resistance:
Although offering good resistance to many corrosive fluids, this material is chosen mainly for its high retained hardness and abrasion resistance.

ISO 9001:2000

Special Materials

Titanium Carbide
Silicon Carbide
Polycarbonate Resin
Acetal Resin
Carpenter 20 Cb-3
M-50 High Speed Steel Cubic Zirconia
Silicon Nitride
Optical Quality Glass