Piston and Sleeve Assemblies

Featured Product from Insaco, Inc.

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In this video, we demonstrate how the very tight tolerance we can hold between parts prevents air from passing through the piston/sleeve interface. The tolerance is roughly 80 millionths of an inch.

Piston/Sleeve Assemblies
These pieces represent a large part of our business we developed by learning how to achieve the very tight diameters, and cylindricities needed for these applications. With piston/sleeve clearances down to .00004″, pumping is possible without use of flexible seals. Applications include cryogenic pumping and precision metering. Materials can be alumina, industrial sapphire, or most other technical ceramics.

Watch>>>Precision Fabrication by Design

High Precision Machining of Hard Materials
Since 1947 Insaco® has been a precision machining and polishing fabricator of parts from all technical ceramics, sapphire, glass and quartz. We machine these materials to very precise tolerances (many times measured in millionths of an inch) for dimension, flatness, wedge and roundness or cylindricity. Our customers typically have a critical application that requires extremely tight tolerances in ultra-hard materials. We also have the capability to grind and polish spherical radius parts in a variety of hard materials, both inside and outside diameters, to optical requirements.

features include:

  • Extremely high accuracy and tight tolerance machining
  • Lights-out manufacturing
  • Machine automation including large capacity envelope
  • Automated centerless grinding
  • High efficiency/low cost volume production
  • Low-volume prototype machining
  • 5-axis machining capability
  • ITAR compliant
  • High-volume robotic machining
  • Video inspection and a Class 100 Cleanroom
  • Extensive Quality Control protocols
  • Sapphire tubes and polishing


Insaco has been fabricating precision parts from all technical ceramics since 1947. Approximately a third of our machining involves sapphire, but our capabilities go way beyond that. Insaco engineers welcome inquiries from designers contemplating specifying technical ceramics for their applications, whether prototype or full production. We only ship parts that meet agreed-to requirements, but are often able to respond to challenges and achieve results others cannot.

Insaco also has extensive inspection and documentation procedures so parts are always to print. With a seasoned team of engineers and machine operators we are available to discuss your application needs including alternative materials and cost drivers. please click here to send a request, or visit our Frequently Asked Questions pageClick here to find out more about our company and our people.

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