Clean Fittings

Hy-Lok USA, Inc.’s high purity Ultra High Purity Fittings set the semiconductor industry standard for weld and metal gasket face fittings.

We offer a variety of solutions including glands, connectors like union, elbow, swivel union and tee; and nut, cap, gasket, and plug connections.

Our face seal fittings feature two sealing beads compressing a metal gasket for maximum leak-free performance, and are fully interchangeable with other major face seal fitting manufacturers. These seals are designed to meet or even exceed the specifications of your project, especially for those in the semiconductor industry. Tube connections are available to 1” O.D.

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Ultra High Purity Fittings Applications

Hy-Lok USA’s fittings are guaranteed to provide you with leak-free performance in almost any demanding application. Our products are widely used throughout a range of industries such as petrochemical and chemical processing, oil and gas, research laboratories, pulp and paper, aerospace and defense, cryogenic and semiconductor, power generation, and shipbuilding.

Our Ultra High Purity Fittings are surface finished to Ra 0.25 µ m (Ra 10 µ in) standards to prevent leaks in high vacuum and positive pressure applications. Clean fittings are double packaged in anti-static polyethylene bags that have been purified by nitrogen gas, all within a class 10 cleanroom environment.

Every product that ships through Hy-Lok USA is thoroughly tested and assessed according to the highest quality standards. Our Ultra High Purity Fittings, in particular, are tested to work with leak rates of 10-9 torr. By partnering with us, you will gain access to a comprehensive and fully-stocked inventory of high-quality fittings and leak-free solutions for dependable, reliable, and efficient performance.

Ultra High Purity Fittings: Weld and Metal Gasket Face Seal Features

  • Available in ¼ to 1 inch and 6 to 18mm sizes
  • 316, 316L, 316L VOD, and 316L VIM VAR Stainless Steel Material
  • Weld fitting for manual or automatic welding equipment
  • VAR and VIM-VAR raw materials are purchased with tightly controlled sulphur content for welding repeatability.


If you have any questions about any of our products or services, don’t hesitate to give us a call. For any inquiries, fill out the form and one of our Hy-Lok representative will contact you soon.


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