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Stein offers a full range of machining services. Off-shore machining operations are located in India, Mexico and the Czech Republic. These plants have achieved ISO and AS9100 Aerospace Certifications and full-scope machining capability. If you prefer, you can contact our overseas plants directly, or you may work through our home plant in Pennsylvania, USA. Machining capabilities of our overseas plants in turning, grinding, and lapping are from 2 to 20 inches in diameter, and for milling, 20” by 40“ by 30” high can be machined. Our plants practice “Lean Manufacturing” in manufacturing cells throughout our facilities. All components we produce are measured to verify dimensional requirements using computer-controlled CMMs.

Seal Manufacturing
Seal Manufacturing


Our US manufacturing facilities are located with our home engineering and executive offices near Philadelphia. We produce many of the same products in the US that we make in our offshore facilities. This dual capability provides added assurance that Stein can get you what you need when you need it. In addition, we have the ability to turn parts up to 48 inches in diameter and mill parts up to 30 inches long by 33 inches wide. Lapped flatness can be achieved on parts up to 48 inches in diameter. We are also NADCAP-approved for welding and nondestructive testing.

Stein Seal has invested heavily in 5- and 6-axis cellular machining technologies. We have recently purchased multi-functioning machining centers with multiple pallets that can mill, turn, and perform 5-axis machining. Running untended, 24 hours a day, these highly efficient machines help Stein keep its pricing competitive.

Stein Seal offers superior product finishing and is qualified for critical cleaning operations, including Ultrasonic washing, Class-A nuclear-grade water generation, and Millipore particle cleanliness testing when required. We also maintain an ISO Class 6 cleanroom with positive airflow.

Stein Seal is certified to ISO 9001:2015 and AS9100D, ensuring the highest quality output in everything we do.

While our focus is on designing, engineering, and manufacturing mechanical sealing systems, the heart of our operation is centered on precision machining and manufacturing capacity. Our fully scaled fabrication group can design, engineer and build to your specifications or from your concepts. We can produce complex components with elaborate geometries using the latest CNC multi-axis machining centers and state-of-the-art CAD/CAM software. Stein can configure the optimal manufacturing process to satisfy any degree of precision at any volume.

Our multi-spindle, multi-axis machining and cellular manufacturing processes adhere to best practices for maximum production efficiency.

  • Blanchard grinding
  • CNC multi-axis grinding
  • Large-diameter turning
  • Vertical CNC milling centers
  • CNC Turning centers
  • Mill-turn centers
  • Precision inspection
  • CMM inspection
  • Double disk lapping
  • Lapping
  • Laser-mark and dot-peen identification
  • Laser surface finishing and geometry
  • Superfinishing