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CNC Machining Kovar Service

Kovar is an iron-nickel-cobalt alloy with a low coefficient of linear expansion and excellent weldability.

DEK offers a one-stop CNC machining kovar on-demand service, where you can get high-precision customized invar parts from prototypes to high-volume production. With our advanced CNC equipment and first-class machining technology, we can achieve tight tolerances of +/- 0.01mm with fast delivery!

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Custom Kovar Parts in CNC Machining

Kovar part(1)

Typically composed of 54% iron, 29% nickel, and 17% cobalt (Kovar 29-17 alloy), Kovar has stable physical properties in environments with wide temperature variations, making it an ideal material for electronic packaging and other precision industrial applications.

DEK has extensive experience and advanced equipment in the field of Kovar machining. We utilize the latest CNC machine tools and precision machining techniques including milling, turning, drilling, grinding and wire cutting to ensure that we are able to meet the requirements of a wide range of complex parts with tight tolerances of up to +/- 0.01mm, ensuring that each part meets stringent quality standards.

DEK is an efficient and professional manufacturer of kovar machined parts, we have specialized in machining kovar for many years, and can guarantee the quality and consistency of the parts, and offer a variety of surface treatments such as polishing, plating, and heat treatments to meet the special requirements of different scenarios. Our high-precision customized invar service is perfect for providing high-quality parts such as, package housings, connectors, and conductive parts for industries that require high technology (such as medical devices and aerospace).

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Kovar Material List


Basic Knowledge of Kovar

What is Kovar?

Kovar is a nickel-cobalt ferrous alloy composed of approximately 29% nickel, 17% cobalt, 54% iron, and small amounts of other elements such as manganese and silicon.

This material is often used for parts requiring dimensional stability in varying temperatures, such as electronic and semiconductor components. The low CTE of Kovar closely matches that of certain glass ceramics, such as borosilicate glass. This makes Kovar a popular choice for hermetic sealing applications, where it is used to create a reliable and tight seal between glass and metal components.

Advantages of Kovar

Low expansion coefficient

Good mechanical properties

Excellent electrical conductivity

High melting point

Compatibility with glass sealing

Thermal stability

Applications of Kovar

Hermetic seals

Aerospace components

Power tubes


Electron tubes

Semiconductor devices


Machining Kovar Buying FAQ

Invar is designed to have a very low coefficient of thermal expansion (CTE) and is thus “in-variant” to temperature, Kovar is designed to be “co-variant”. It was designed so that its CTE closely matched that of borosilicate glasses but it is a good match for some alumina ceramics as well.
Kovar is known for its low coefficient of thermal expansion.Though Nickel has good resistance and it is present at 29% – which is pretty high – you have to account for the 53% iron where the iron oxide has to be controlled for to prevent rusting.
Kovar is magnetic due to its iron-nickel composition.
Kovar is weldable using common techniques such as electron beam, laser, and resistance welding.
Kovar has good strength and is often chosen for its combination of mechanical and thermal properties.

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