Kovar Round Bars are precision-engineered iron-nickel-cobalt alloy bars manufactured to deliver exceptional dimensional stability and a controlled coefficient of thermal expansion. Conforming to UNS K94610 and Material No. 1.3981, these round bars are widely used in applications requiring reliable glass-to-metal and ceramic-to-metal sealing. Their excellent thermal compatibility, good mechanical strength, and stable electrical properties make them suitable for aerospace, electronics, semiconductor, telecommunications, and defense industries.
Manufactured using premium-quality raw materials and advanced production techniques, our Kovar Round Bars are available in round, flat, square, hexagonal, rectangular, and custom profiles with hot rolled, cold drawn, forged, or polished finishes. Every bar undergoes stringent quality inspections to ensure dimensional accuracy, superior surface finish, and consistent performance under demanding operating conditions.
Grade: Kovar Round Bar
Square bar size : 4 to 100mm
Hollow Bar : 32mm OD x 16mm ID to 250mm OD x 200mm ID)
Hex Bar size : 2-100mm A/F
Rectangles Size : 33 x 30mm to 295 x 1066mm
Flat bar size : Thickness: 2 -100mm, Width: 10 to 500mm
Round bar size : Diameter: 3-~800mm
Surface: Bright, Hot Rolled Pickled, Cold Drawn, Sand Blasting Finished, Polished, Hairline
Tolerance : H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements
Technique : Hot Rolled, Cold Drawn, Cold Rolled, Forged Round Bar, Rod
Condition : Hardened & tempered, annealed
Finish : Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black
Processing : Bar cutting to 650mm
Kovar Round Bars Equivalent Grades
STANDARD: Kovar
Material No: 1.3981
UNS: K94610
Advantages
- Excellent thermal expansion characteristics make Kovar Round Bars ideal for precision glass-to-metal and ceramic sealing applications.
- Manufactured using premium raw materials with strict dimensional tolerances, ensuring superior performance and long service life.
- Each batch undergoes comprehensive chemical, mechanical, dimensional, ultrasonic, and visual inspections, maintaining a defect rate below 1%.
- Available in customized diameters, lengths, surface finishes, machining, cutting, and packaging as per customer specifications.
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