Engineered OEM Products


The Stein Seal ® Company has developed API1 STANDARD 682 seals for the oil and gas industry. Stein Seal® has designed, manufactured and tested the seals according to the rigorous API Standard 682 test protocols. In general, these are balanced seals with cartridge construction. These seals are classified in to Types, Category, Arrangements and Configurations. The seals are designed and tested to operate continuously for 25,000 hours without need for replacements.


Ø Seal designs are fully compliant to API Standard 682 design guidelines and test protocols.

Ø Precise control of seal face tolerances provides superior performance such as low leakage, less heat generation and longer life.

Ø Modular cartridge design for quick installation and precise shaft alignment.

Ø Seals fit in most popular pump seal housings.

Ø Seals are pressure balanced to extend operating range including pressure reversals up to 40 psi (2.75 bar).

Ø High performance premium grades of carbon and carbide faces are used in all designs.

Ø Seals are available for shaft sizes ranging from 1 inch (25mm) to 5 inch (127mm) in .125 inch (3mm) increments.

Ø Seal sizes over 5 inches (127 mm) are designed and supplied as Custom Engineered Seal to meet the customer requirements.


A seal piping plan is designed, manufactured and supplied to improve the environment around the mechanical seal and therefore increase the performance and reliability of the seal. Piping plans range from very simple systems such as fluid recirculation into the seal chamber to complex systems which provide pressurization, cooling and circulation for support fluids and gases. The basic operation of the piping plan and also the requirements for instrumentation are followed as per API Standard 682 guidelines. Major piping plans supplied by Stein Seal ® are Plan-21, Plan-23, Plan-32, Plan-52, Plan-53A, Plan-53B & Plan-53C.

Our API 682 seal design features, manufacturing capabilities and test facilities are witnessed and certified by a third party international certification organization.

Bellows Seals

Stein’s design and technical expertise in the manufacture of seals has resulted in a bellows seal with reliable, consistent performance unusual in the industry. Generally paired with face seals, our bellows seals offer outstanding performance in gas or liquid applications characterized by highly toxic, corrosive, high temperature and high-pressure environments. Depending on the application, bellows may be machined, or either hydroformed or welded using Inconel, titanium or 300 stainless steel.

Key Bellows Features:

  • Forms a frictionless secondary seal when used with other seals
  • Supplies axial springing for the mechanical seal that allows the bellows to operate over a long axial length
  • Pressure balanced under actual design operating pressures to ensure consistent performance

Bushing Seals

Stein’s bushing seals are the perfect choice for high-pressure gas and liquid applications. Each bushing seal is custom designed to fit the application and is often combined with our other seals to create sealing systems that meet the most stringent operating requirements. The bushing seal is a sleeve that forms a small clearance about a shaft where leakage is limited by flow resistance between the clearance and the bushing. Bushings can be designed in either a fixed or floating sleeve configuration depending on the operating clearance requirements, shaft movement, vibration or misalignment. For machinery such as steam turbines, segmented bushings allow easy maintenance access to the shaft.

Typical applications include aircraft engine main shaft seals, compressors, pumps, and high-speed processing equipment. Configurations include either a floating design or fixed design depending on the tolerances of the specific seal applications


Key Bushing Seal Features:

  • Floating bushings move radially, but are captured axially in the housing with spring loading, to better tolerate any shaft movement
  • Available in a wide variety of materials suitable to each application: alloy, steels, 300/400 series stainless steel, Inconels, Hastelloy, ceramics and carbon graphite

    Circumferential Carbon Seals

    Stein Seal’s line of precision crafted circumferential carbon seals are 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. The exceptionally lightweight carbon material and split housing capability make it easy to install, remove or repair seals in limited space areas.

    Common applications include:

    • Aircraft engine main shafts and accessory gearboxes
    • Recirculation pumps
    • Process industry
    • Propulsion systems

    Configurations include standard single ring, back-to-back, face-to-face, or a tandem arrangement.



    Key Features:

    • Unique design increases flexibility to provide better sealing
    • Special gap segments permit the seal to adjust dimensionally for minimal leakage
    • Distinctive fabrication reduces pressure loading to maximize seal life
    • The use of compression and garter springs ensures that the segments remain in contact with mating surfaces during low delta pressure and shutdown conditions

      Carbon Face Seals

      Stein Seal’s extensive line of precision crafted face seals meets our customers’ demanding criteria for innovation, performance, versatility and reliability. Whether used independently or as part of a sealing system, our face seals are the smart choice for gas and liquid applications that require high-pressures and high shaft speeds, with moderate axial shaft movement.

      Common applications include gearboxes, aircraft engine main shafts, compressors, pumps, and propulsion systems. Our seals are fast and easy to install, maintain and replace to minimize downtime and reduce cost. Configurations include standard single ring, back-to-back, face-to-face, or a tandem arrangement.

      Key Face Seal Features:

      • Efficiently manage radial shaft movements while maintaining low leakage rates
      • Leakage rates remain constant over the life of the seal ensuring consistent, reliable sealing
      • Pressure balanced for higher delta pressure capability and decreased heat generation for long seal life
      • Designed to tolerate sudden pressure reversals, such as in chemical gas applications

        Barrier Seals

        The circumferential barrier seal is a bore contacting device, highly effective as a gas seal and adaptable to many types of service. Stein Seal priovides circumferential barrier seals as a standard device with our dry gas seal packages.



        Key Features:


        • These seal swill act as a barrier to prevent the leakage of hazardous gases for entering the bearing cavities
        • Exclude oil from entering the dry gas seal area if the compressor bearing is lubricated with oil
        • In the event of a dry gas seal malfunction, the barrier seal will contain the excessive loss of compressor gases until the unit is safely shut down