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Stein Seal’s line of precision-crafted circumferential sealing devices is perfect for low-pressure applications where minimal controlled gas leakage, high temperatures, unlimited axial shaft movement and low wear are critical. They can be used independently or as part of a sealing system. A split housing option makes it fast and easy to assemble the seal around a shaft.


A versatile choice for a wide range of applications, our circumferential seals offer exceptional performance in aircraft engine main shafts, accessory gearboxes, compressors, centrifuges, pumps and chemical processing equipment.

Circumferential seals comprise three or more carbon segments that create a ring contained in a seal housing. The segments are radially loaded against the shaft using a garter spring, and each seal ring segment is locked against rotation.

Our primary circumferential seal is a contacting device that seals directly against the shaft. It is designed to exclude dangerous or toxic gases and prevent contamination of oil sumps. We also offer clearance, film riding, gas and liquid circumferential seals, which have a specific bore geometry to create hydrodynamic lift or suction, permitting the seal to operate under high-pressure differentials, or liquid or alternating liquid and gas environments.

Circumferential seals are available in several configurations, including standard single ring, back-to-back, face-to-face, or in a tandem arrangement.


All our circumferential seals meet or exceed our rigorous specifications and are tested extensively to ensure compliance with industry standards.

  • Shaft rotation speeds up to 600 ft/s (183 m/s);
  • Temperature ranges over 1000°F (538°C),
  • Pressure ranges up to 85 psid (586 KPa).
  • Diameter sizes from 0.925” to 41.500” (23.495 to 1054.100 mm)*
  • Seal life may exceed 20,000 hours
Circumferential Seals

* There is no practical upper limit restriction to diameter.


Circumferential seals are a key element in the efficient functioning of compressors, generators, centrifuges, pumps, gas turbines and chemical processing equipment. They operate effectively and consistently at high temperatures and speeds with minimal leakage and low wear. Often paired with our dry gas face seal to make a reliable sealing system, the circumferential seal can also function as an emergency shutdown seal if the dry gas face seal fails.

In marine propulsion applications, circumferential seals are most often used on the bulkhead shaft and in gas turbine drives and gearboxes to provide low leakage under moderate pressure. Used alone or as a component of a multiple seal, our flexible, split-circumferential seal allows fast, easy installation on very large shaft diameters without disturbing other equipment.

When installed on water turbine shafts and in gas-cooled generators, this reliable, long-wearing seal can handle the many challenges of power generation applications, including the effects of radiation, decontamination, vibration and misalignment on seal performance, conditions that often occur in nuclear reactor systems applications.


As a supplier of first-class, custom-designed seals, Stein Seal continuously invests in our resources and capabilities: expert design engineers with solid technical credentials and years of hands-on experience in a broad range of applications, our proven manufacturing techniques, superior quality and testing processes, and a responsive customer support staff. This investment allows us to deliver innovative, reliable sealing systems that meet and surpass both our customers’ requirements as well as most design standards.

We are committed to our long-established, collaborative working relationships with our customers and pledge to continue to deliver unparalleled value in products and services today and in the future.

For more information on our circumferential seals, our complete line of seal products, or to discuss your application requirements with our experts, please contact Stein Seal Industries.