Reverse Engineering Capabilities

Customers sometimes find themselves needing to purchase obsolete mechanical seal assemblies in support of critical machinery.  This can occur if the seal manufacturer goes out of business or decides not to continue to manufacture the assembly at a reasonable price.  We offer reverse engineering services for mechanical seals and associated parts at a nominal charge when it leads to the sale of the reverse engineered product.

Our engineers are familiar with most types of seals and the design requirements for their proper performance. Typically, our engineers would want the customer to send several examples of the subject seal to help determine the allowable dimensional variation of part.  These parts are then measured on calibrated Coordinate Measuring Machines to determine the exact dimensions of the components used.

Chemical and physical analysis is performed on all critical components to determine not only the material, but the processing required for that material.  Our carbon suppliers are willing to verify the manufacturer and grade of any carbon that may be used in the subject seal.

Industrial and Aerospace
Seal Repair and Overhaul

For over 50 years the Stein Seal Company has manufactured, repaired, overhauled and redesigned seals and sealing systems for aerospace and other applications.

Stein Seal, a privately owned company, can tailor a design and service contract to meet your needs. Stein Seal is an ISO 9001:2015 certified manufacturer of seals and sealing systems with a dedicated repair department and 80 CNC machines in our production area to enhance our repair delivery capability. Support is also provided through our engineering department and test lab. When required, one of Stein Seal’s 24 test rigs can be used to verify performance at actual operating conditions. Customers are invited to witness the testing of their seal and sealing system.

Our seal rig testing capability includes:

  • Staff of 8 Technicians under the direction of Engineering
  • 15,000 Sq. Ft. (1,393 Sq. M.) of Lab Floor Space
  • 24 Dynamic Test Rigs including 2 Inter-shaft Rigs
  • Seal Diameters up to 24 inches (60 cm)
  • Maximum Shaft Speed of 70,000 rpm on seal diameter of 2.0 inches (50.8 mm) or less
  • Maximum Shaft Speed of 30,000 rpm for most other diameters
  • Maximum Oil Pressure of 4,000 psi (27,579 kPa)
  • Maximum Gas Pressure of 3,000 psi (20,684 kPa)
  • Maximum Temperature of 1,500°F (815°C)

Precision Machining

Some say that grinding is a lost art, but not at Stein Seal Company.  We have over a dozen CNC cylindrical grinders capable of grinding diameters of over 24 inches. Grinding services, along with standard machine shop machining, are offered by our Company.   Stein Seal is certified to ISO 9001:2015 and AS9100D, so you know that your parts will be made to the highest quality. 

Off-shore machining operations are located in India, Mexico and the Czech Republic. All of these plants have achieved ISO and Aerospace Certification and have full scope machining capability.  If you prefer you can contact our overseas plants directly, or you may work thru our home plant in Pennsylvania, USA.  Machining capabilities of our overseas plants in turning, grinding, and lapping are from 3 inch to 16 inches diameter and for milling sizes 20 inch by 40 inch by 12” high can be machined.  Our plants practice “Lean Manufacturing” with the use of manufacturing cells throughout our facilities.  All components we produce are measured to verify dimensional requirements using computer controlled CMMs.

Our US manufacturing facilities are located outside of Philadelphia in three facilities that total over 215,000 square feet (20,000 square meters) and are located with our home engineering and executive offices.  We produce many of the same products in our US operations as we do at our offshore facilities. This dual manufacturing capability provides you assurance that there is a back-up in the event of a disaster at one facility.  In addition, we have the capacity to turn parts up to 56 inches in diameter and mill parts up to 60 inches long by 33 inches wide.  Lapped flatness can be achieved on parts up to 48 inch diameter.  We also are NADCAP approved for welding.

Stein Seal has invested heavily in mill-turning machines with dual chucks, which have proven to be highly efficient. More recently we have purchased Multi-Function machining centers with multiple pallets that can mill, turn, and perform 5-axis machining. These machines run untended 24 hours per day and parts to be machined can be loaded on pallets well before they are needed for machining.  These machines are highly efficient and are helping to keep our costs competitive.  

In addition to general machining, including grinding, Stein Seal offers superior product finishing capability.  We are qualified for critical cleaning operations that include particle counting after cleaning when required.  We also maintain a clean room with positive air flow which we use to make critical assemblies for aerospace, nuclear and other critical products.

Dynamic Test Rig

Stein Seal® Company developed dynamic test rig capable of simulating extreme engine attitudes at any angle ranging from horizontal up to 90⁰ vertical in order to verify seal performance. In addition to matching gas turbine engine bearing sump pressures and temperatures, the rig shaft rotates at speeds up to 20,000 rpm and can be maintained during the entire tilting process.

Dynamic Test Laboratory

Extreme Testing Seals and Sealing Systems

In Stein’s test lab, we can accurately simulate the extreme limits of operating conditions, which allows us to accurately predict and verify performance under the most rigorous operating conditions.

Each of our over 20 dynamic test rigs, including 2 inter-shaft rigs, is custom designed to meet Stein’s high standards and each can be reconfigured quickly for multiple programs to provide fast, concurrent and cost-efficient testing for our customers.

Our testing expertise and equipment are also available to our customers so that they may validate their own designs, or test non-seal related components or systems.

General Test Capabilities:

  • Seal Diameters: up to 60 cm (24 inches)
  • Shaft Speeds: up to 70,000 rpm
  • Oil Pressures: up to 30,000 KPa (4,000 psi)
  • Gas Pressures: up to 20,000 KPa (3,000 psi)
  • Temperatures: up to 815° C (1,500°F)


+1 215-256-0201


1500 Industrial Boulevard 

KulpsvillePA 19443-0316



Stein Seal Company
P.O. Box 316
1500 Industrial Blvd.
Kulpsville, PA 19443-0316 U.S.A.

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