Fahad Metals, located in Jakarta, Indonesia, is a reliable manufacturer and supplier of Kovar Bars and Rods, designed specifically for applications that require precise control over thermal expansion. We take pride in offering high-quality Kovar products that meet international standards like ASTM F15 and MIL-I-23011. Kovar is commonly used in glass-to-metal and ceramic-to-metal seals, particularly in situations where maintaining dimensional stability during temperature changes is crucial. Our Kovar bars and rods are celebrated for their outstanding machinability and consistent performance across industries such as electronics, aerospace, and scientific instrumentation. At Fahad Metals, we are dedicated to providing dependable, precision-grade materials for advanced and specialized industrial needs.
Kovar is an iron-nickel-cobalt alloy that consists of about 29% nickel, 17% cobalt, and the remainder being iron, along with small amounts of manganese and silicon. This alloy is recognized for its low and controlled coefficient of thermal expansion, which aligns perfectly with borosilicate glass. Kovar bars and rods boast a tensile strength ranging from 500 to 750 MPa, a yield strength of around 400 MPa, and impressive ductility with elongation up to 30%. The alloy remains stable across a broad temperature range, exhibits excellent mechanical strength, and can be welded, brazed, and machined with great precision.
| Standards : | UNS K94610 | Werkstoff Nr 1.3981 | DIN 17745 | ASTM F15 | AMS 7726 | AFNOR NF A54-301 | S.E.W 385 |
| Size Range : | 0.015″ Thk up to 2″ Thk |
| Thickness : | Range from .008″ to .0125″ |
| Length : | 2m, 2.44m, 3m, or as required |
| Width : | 10-2500mm |
| Weight % | Ni | Fe | Co | C | Mn | Si | Al | Cr | Mg | Zr | Ti | Cu | Mo |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy K Kovar | 29.0 | 53.0 | 17.0 | 0.04 max | 0.50 max | 0.20 | 0.10 max | 0.20 max | 0.10 max | 0.10 max | 0.10 max | 0.20 max | 0.20 max |
| Material | Condition | Yield Strength (0.1% Offset) | Tensile Strength | Elongation % | ||
|---|---|---|---|---|---|---|
| psi | MPa | psi | MPa | |||
| Alloy K Kovar | Annealed | 49,000 | 340 | 75,000 | 520 | 42 |
| ASTM | UNS | Workstoff | AMS | DIN | AFNOR | S.E.W |
| F15 | K94610 | 1.3981 | 7726 | 17745 | NF A54-301 | 385 |
Kovar bars and rods are primarily utilized in glass-to-metal and ceramic-to-metal sealing applications due to their compatible thermal expansion characteristics. They play a vital role in electronic and vacuum tube components, including transistor housings, diodes, microwave tubes, and semiconductor packages, where airtight sealing is essential. In the aerospace and defense sectors, Kovar is employed for sensor enclosures, hermetic feedthroughs, and instrument casings. Manufacturers of scientific equipment depend on Kovar for laser housings, X-ray devices, and cryogenic systems. Its thermal stability and exceptional performance make it a go-to choice for high-tech applications.






We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Fahad Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Indonesia, Jakarta
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