Omniseal® Metals

Metal Comma Seals

Comma axial seals used for shaft sealing and bore sealing are a further development of the axial C-Seal. The elastic recovery in radial direction is still limited, yet the leakage over the outer diameter in the case of a Comma seal is well controlled by the seating load generated by the compression of the ring part of the design.

See More

Silver, gold or copper plating enhances tightness performance and lowers friction during assembly and operation.


They are typically used in valves, semi-dynamic applications, connectors and in areas that need rod seals and piston seals.

Standard Specifications

Inconel x-750, 718, 625, SS, Haynes (other materials are available on request)

Used in

Slow dynamic applications & provides better control of the seating load


-250 to +1100°C

(-423 to +2000°F)


High vacuum to 5500 bar (79770 psi, 550 MPa) with support

Max Speed

Very low

Diameter: < 20 mm (0.750")
Cross-section: 1.57  to 4.78 mm
Minimum Tolerances: -/+0.05 mm

Omniseal Solutions can help you with your project

Design engineering

A team of expert designers


Customized solutions & materials to suit your projects

Space Satellite

Expert of precision seals

Omniseal Solutions can help you with your project

Seal Function & Motion


Mating Surface Finish

Along with having an excellent surface finish, it is also important that the mating surface has a sufficient hardness. For high abrasive dynamic applications, a hardness higher than 60 HRC is recommended.

ASE Group


Our Comma seal design is developed to seal better than a typical axial C-Seal. It also allows a better control of the seating load and hence a better seal performance. 

Industry Case Studies

Take a closer look at case studies that detail this metal seal's high performance.