ZCO O-Ring Face Seal Fittings

Hy-Lok USA, Inc. ZCO O-ring Face Seal Fittings are designed for quick, easy installation in zero clearance areas.

They are easily placed and removed from piped components, simplifying the layout of tubing and skid size. These fittings reduce the number of elbows and connections required, especially in areas with limited space.

What are ZCO O-Ring Face Seal Fittings?

Also known as “zero clearance connections,” these fittings also make it easier than ever to disassemble when a component or valve needs to be removed from the system. This can be done by simply loosening any backnuts and removing the component. These fittings save you the labor of dismantling numerous components to gain access to only one component and easily service the valves.

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ZCO O-Ring Fitting Applications

ZCO O-ring Face Seal fittings are suitable for anything from high pressure to vacuum applications, and feature a wide temperature up to 550° F (280° C). At Hy-Lok USA, we are capable of providing solutions to match almost any thread size, with large through-holes for maximum and efficient flow.

Additional O-ring Face Seal Fitting features include safety leak test ports, machined finishes for leak-free seals, and highly efficient enclosed o-rings. All ZCO Ring Face Seal Fittings have been helium lock tested to a rate of 4x 10-9 std cm3 /s without leakage. O-Ring Face Seal assemblies consist of three basic components: the female nut, the gland, and the body.

ZCO O-Ring Face Seal Fittings are rated for operation up to 15,000 psi or 1030 bar, being able to withstand temperatures from -20°F (28°C) to 550°F (288°C), allowing installation and operation in a variety of environments. By eliminating clearance assemblies, these fittings also greatly reduce the coning, threading, or welding necessary. Technicians only need to lube the respective threads, attach mating parts, and tighten the connection.

For more information, find a Hy-Lok distributor in your area.

ZCO O-Ring Face Seal Fitting Specifications:

  • Size: 1/4" through 1"
  • Max Working Pressure: 14300 psig (980 bar)
  • Max Temperature: 550° F (280° C)
  • Body, Gland and Nut Alloy: 316 Stainless Steel *
  • Weldable Gland Alloy: 316L Stainless Steel *
  • O-Ring Material:70 Durometer Flurocarbon (Viton) is standard and **90 Durometer Flurocarbon on SAE/MS threads

* Optional body, gland, and nut alloys are available upon request

** Optional o-rings include Fluorocarbon, Buna N, TFE, Perfluoroelastomer (Kalrez), and Ethylene Propylene


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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