Kovar Machining Services

For Critical Applications

We specialize in high-precision Kovar component manufacturing, delivering tight-tolerance parts for electronics, aerospace, and medical industries. Our advanced Kovar cnc machining processes ensure optimal performance of your Kovar-based products.

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Comprehensive Kovar
Machining Solutions

From prototype development to high-volume production, we offer end-to-end Kovar machining services tailored to your specific requirements.

Professional processing materials: Kovar 4J29 / ASTM F15 / 4J33 / 304 / SUS304 / N6 / Nickel200 / Nickel99 / TA1 / GR1 / BT1-0 / JIS TI1

CNC Precision Machining

Advanced Advanced 3-axis, 4-axis, and 5-axis CNC machining for complex Kovar components with tight tolerances (±0.001mm) and superior surface finish.

–Milling & turning operations

–Complex geometries

–Repeatable accuracy

Custom Kovar Fabrication

Tailored Kovar fabrication services including cutting, forming, welding, and assembly to meet your unique design specifications and application needs.

–Laser cutting & waterjet cutting

—Precision forming & bending

—Hermetic sealing compatibility

Quality Assurance & Testing

Rigorous quality control processes including dimensional inspection, material verification, and performance testing to ensure Kovar components meet industry standards.

–CMM dimensional analysis

–Material composition testing

–Environmental stress testing

Advanced Kovar Machining Technology

Equipped with state-of-the-art machining equipment and a team of skilled engineers, we deliver Kovar components that meet the most demanding industry requirements.

Tight Tolerance Control

Achieve consistent precision with our advanced CNC systems, capable of holding tolerances as tight as ±0.001mm for complex Kovar geometries.

High-Volume Production

Our automated production lines support high-volume Kovar component manufacturing while maintaining strict quality standards and on-time delivery.

Design Engineering Support

Our engineering team provides DFM (Design for Manufacturability) analysis to optimize your Kovar component designs for cost and performance.

Why Kovar for Your Critical Components?

Kovar (ASTM F-15) is a nickel-iron-cobalt alloy renowned for its low coefficient of thermal expansion, making it ideal for applications requiring hermetic sealing with glass or ceramic.

Key Kovar Properties

  • Low Thermal Expansion

    Matches the thermal expansion of borosilicate glass (3.3 x 10⁻⁶/°C), enabling reliable hermetic seals.

  • Corrosion Resistance

    Excellent resistance to atmospheric corrosion and most industrial environments.

  • Mechanical Strength

    High tensile strength and ductility for reliable performance in demanding applications.

  • Machinability                                                        Good machinability with proper tooling, allowing for complex geometries and tight tolerances.

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Frequently Asked Questions

1.About Kovar Material

Kovar is a nickel-iron-cobalt alloy (typically 54% Fe, 29% Ni, 17% Co) with a thermal expansion coefficient closely matching borosilicate glass. This makes it ideal for hermetic sealing applications in electronics, aerospace, and medical devices. For machining, Kovar is considered a “difficult-to-machine” material due to its high strength, toughness, and tendency to work-harden. It requires sharp, wear-resistant tools (e.g., carbide inserts), controlled cutting speeds, and proper cooling to avoid tool wear and material deformation.
Kovar machined components are widely used in industries requiring hermetic sealing and thermal compatibility, including: Aerospace & Defense (satellite components, missile systems), Electronics (vacuum tubes, semiconductor packaging, connectors), Medical Devices (implantable sensors, diagnostic equipment), Optics (laser housings, optical fiber components), and Industrial Automation (high-precision sensors, vacuum equipment).

2.Machining Capabilities

We provide a full range of precision machining processes tailored to Kovar, including: CNC Turning (for cylindrical parts like pins, sleeves, and connectors), CNC Milling (for complex geometries, brackets, and housings), Drilling & Tapping (precision holes with tight tolerances), Grinding (surface grinding, cylindrical grinding for ultra-smooth finishes), and Wire EDM (for intricate shapes and thin-walled parts without tool contact). We also offer secondary processes like polishing, plating, and hermetic sealing integration.
Our precision machining capabilities for Kovar allow us to meet tight tolerances down to ±0.0001 inches (±0.0025 mm) for critical dimensions, depending on part size, geometry, and volume. For standard components, typical tolerances range from ±0.0005 inches to ±0.001 inches. We use advanced metrology equipment (e.g., coordinate measuring machines, optical comparators) to verify tolerances and ensure consistency across all parts.
Yes, we cater to both low-volume prototypes and high-volume production runs for Kovar parts. For prototypes (1-100 pieces), we offer rapid turnaround using flexible CNC setups to support your product development cycle. For high-volume production (10,000+ pieces), we optimize processes with dedicated tooling, automation, and lean manufacturing practices to ensure efficiency, consistency, and cost-effectiveness. We also handle medium-volume runs (100-10,000 pieces) with scalable solutions.

3.Customization & Design Support

Absolutely. We specialize in custom Kovar machining to meet your unique design requirements. Our engineering team works closely with you from the initial design phase to review part drawings (CAD files accepted in STEP, IGES, DWG, or DXF formats), provide DFM (Design for Manufacturability) feedback, and optimize the machining process for Kovar’s properties. Whether you need a one-of-a-kind prototype or a custom production part, we tailor our services to your specifications.
When designing Kovar parts for machining, key considerations include: Avoid sharp internal corners (use fillets or chamfers to reduce stress concentration and tool wear); Minimize thin walls (Kovar’s toughness can cause deformation in walls thinner than 0.010 inches); Account for thermal expansion (match mating parts to Kovar’s coefficient for hermetic sealing); Specify clear tolerances (critical for sealing applications); and Choose appropriate surface finishes (to support plating or bonding). Our team can assist with DFM reviews to refine your design for manufacturability and performance.

4.Quality & Certification

We maintain strict quality control (QC) throughout the machining process. Key QC measures include: Incoming material inspection (verifying Kovar alloy composition with spectrometry); In-process checks (using calipers, micrometers, and optical tools to monitor dimensions during machining); Final inspection (coordinate measuring machine (CMM) for 3D dimensional verification); and Documentation (certificates of conformance (CoC), material test reports (MTR), and dimensional inspection reports). We also follow ISO 9001:2015 quality management system standards.
Yes. We supply full material certificates (MTRs) for all Kovar parts, which include alloy composition, mechanical properties (tensile strength, hardness), heat treatment records (if applicable), and traceability information. For critical applications (e.g., aerospace, medical), we can also provide additional testing documentation, such as ultrasonic inspection reports or hermeticity test results.

5.Lead Time & Logistics

Lead times vary based on part complexity, volume, and secondary processes. For prototype orders (1-100 pieces), typical lead time is 3-7 business days. For medium-volume runs (100-10,000 pieces), lead time is 7-15 business days. For high-volume production (10,000+ pieces), lead time ranges from 15-30 business days. Rush orders are available upon request, with expedited lead times (1-3 business days for prototypes) for urgent projects.
Yes, we offer global shipping for Kovar machined parts. We work with trusted logistics partners (e.g., DHL, FedEx, UPS) to provide fast, reliable shipping to destinations worldwide. We handle all necessary documentation, including commercial invoices, export declarations, and certifications (if required for customs). For large-volume orders, we can also arrange sea freight to optimize cost.

6.Pricing & Quotes

Pricing is based on several factors: Part complexity (geometry, tolerances, number of operations); Material cost (Kovar alloy grade and part weight); Volume (quantity of parts, with discounts for high-volume runs); Secondary processes (plating, heat treatment, assembly); and Lead time (rush orders may incur a premium). To provide an accurate quote, we require a detailed CAD drawing, material specification, volume, tolerances, and any secondary process requirements.
Absolutely. We offer free, no-obligation quotes for all Kovar machining projects. Simply submit your CAD drawing (STEP, IGES, DWG, DXF) and project details (volume, tolerances, secondary processes, lead time) via our website’s quote request form, email, or phone. Our engineering team will review your requirements and provide a detailed quote within 24-48 business hours. We also offer design feedback to help optimize your part for cost and manufacturability.

7.Post-Machining Services

Yes, we provide a range of surface treatments for Kovar parts to enhance performance, corrosion resistance, or compatibility with other components. Common treatments include: Nickel plating (for corrosion resistance and solderability), Gold plating (for electrical conductivity and biocompatibility), Passivation (to improve corrosion resistance), and Polishing (for ultra-smooth surfaces, ideal for sealing applications). We can also coordinate with trusted partners for specialized treatments like anodizing or PVD coating.
Yes. We offer value-added services including assembly of Kovar components with other materials (e.g., glass, ceramics, metals) and hermetic sealing integration. Our team has experience with hermetic sealing processes like welding (laser, electron beam) and brazing, ensuring a leak-tight seal for critical applications. We can also test hermeticity using helium leak detection to meet industry standards (e.g., MIL-STD-883).

8.Other Questions

We machine all standard Kovar grades, including Kovar 4J29 (the most common grade, compatible with borosilicate glass), Kovar 4J36 (low-expansion variant), and custom Kovar alloys tailored to specific thermal or mechanical requirements. We source Kovar from certified suppliers to ensure consistent quality and traceability.
We stand behind the quality of our work. If Kovar parts do not meet your specified requirements (tolerances, material, or design), please contact us within 7 business days of receipt. We will investigate the issue, and if the defect is due to our machining process, we will replace the parts at no cost or issue a refund. Custom parts are non-returnable unless they are defective, as they are manufactured to your unique specifications.
Nanjing Kovar Precision Technology Co., Ltd.

We are committed to the production and processing of precision vacuum sealing technology product parts.

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Liuhe High-tech Development Zone, Nanjing City, Jiangsu Province, China

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