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