At a glance

Processes Lead Time Finishing Options Tolerance
CNC Mill
CNC Lathe
As fast as 7 days Vibratory Tumbling, Media Blasting, Powdercoating With drawing: as low as +/- 0.005 mm
No drawing: ISO 2768 medium

About the Material

Kovar is a nickel-cobalt alloy best known for its ability to expand at a similar rate to glass when exposed to heat. Additionally, the material has excellent dimensional stability at a wide range of temperatures.

Materials Properties


Yield Strength (tensile)Elongation at BreakHardnessDensity
55,000 PSI30%Rockwell B1058.36 g/cm^3
0.3lb / in^3

Material Finish

Kovar is very similar to most grades of steels/stainless steel in terms of overall appearance. Kovar can be media blasted or tumbled to achieve a multitude of surface finishes. Additionally, powder coating can be applied to achieve more matte/glossy colors.

Design Recommendations


Min Wall Thickness

Min End Mill Size

Min Drill Size

Max Part Size


Radii : Depth

0.5 mm
0.8 mm (0.03 in)
0.5 mm (0.02 in)
1200 x 500 x 152 mm [x,y,z] (mill)
152 x 394 mm [d,h] (lathe)
Square profile, full radius, dovetail profiles
Depth must not exceed 12x drill bit diameter.
For end mills, depth must not exceed 10x tool diameter.

Cost Saving Tip

To reduce costs, limit the number of part setups, the number of inspection dimensions or tight tolerances, and deep pockets with small radii. If surface finish is not a concern, you may design your part to be made from the closest stock thickness, specified in a drawing.


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