Hydrogen-Powered Vehicle (70 MPa high-pressure FCVs, EC79 Approval)


FITOK 20D Series Double Ferrule Tube Fittings EC-79 Certified, up to 20000 psi (1379 bar)


For decades, Hydrogen has been safely used in a variety of applications, such as petroleum refining, glass purification, semiconductor manufacturing, fertilizer production, aerospace applications, as a cooler for powerplant generators, etc.


New applications for Hydrogen are emerging, such as using it as an alternative fuel. Recently, more and more auto manufacturers are developing fuel cell vehicles (FCVs) powered by hydrogen gas. Types of FCVs include industrial trucks (35MPa) and passenger cars (70MPa). These vehicles create new technological challenges for high pressure gas system designers. Small-molecule gases are more difficult to seal than liquids. How fittings and tubing are handled during installation makes a difference in sealing performance.


FITOK 20D Series Double Ferrule Type Tube Fittings are designed and manufactured to be secure and gas-tight. They can be installed by wrench turns or pre-assembled by presetting tools (manual/hydraulic). Their mechanical grip design allows for easy installation and ensures that no torque is transmitted to the tubing during installation.

Installation Comparison
Coned and Threaded Fittings
FITOK 20D Series Tube Fittings (formerly known as DHL Series)
FITOK 20M Series Medium Pressure Fittings
FITOK 20D Series Tube Fittings
① Coning Tools
FITOK Manual Coning Tools
② Threading Tools
FITOK Manual Threading Tools
③ Reseating Tools
FITOK Manual Reseating Tools
④ Cutting Oil
FITOK Manual Threading Tools
① Wrench
FITOK Wrench
(O.D. 1/8”, 1/4”, 3/8” and 1/2”)
Assembly Process
Coning, threading and special cleanin
1 ¼ turn easy assembly operation, experienced a 70-80%
reduction of assembly work compared to cone and thread
After Assembly
Difficult to clean the residual cutting oil in the fitting
body and tubing
Ready to use!

FITOK is continuously expanding its product certifications to EC-79 standards (view the Approval Certificate for 6 Series and 20D Series Tube Fittings) for use in hydrogen applications, with respect to the test program below:
FITOK,20D Series Tube FittingsFITOK,EC79 Certified
(EU) No 406/2010
Test Procedures
Hydrogen compatibility test
Corrosion resistance test
Endurance test
Hydraulic pressure cycle test
External leakage test

Please contact us directly online or contact your nearest authorized distributor for more details!

Related Articles:

This website uses cookies in order to improve your user experience. By clicking "Accept" or continuing to use our website, you consent to our use of cookies as defined in this Cookie Policy.

fitokgroup.com Cookie Notice and Disclosure

Last updated June 16, 2020


Like many companies, FITOK Group, its subsidiaries and its authorized sales and service centers (collectively, "FITOK" or "we, " "us, " or "our") use "cookies" and similar tools on fitokgroup.com and any authorized sales and service center website (collectively, the "Sites") to facilitate and improve your online experience. This Notice explains how we do that.  
What are cookies?
A cookie is a small file or piece of information which is downloaded to your computer or device when you visit the Sites, and then sent back to the Sites in order to allow us to recognize your computer or device later. Although certain cookies may contain personal data – for example, if you click to "remember me" when logging in, a cookie may store your username – most cookies won’t collect personal data that identifies you. Rather, most cookies collect general information, such as how users arrive at and use the Sites, or a user’s general location. By collecting this information, cookies help to analyze web traffic and allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.
How do we use cookies?
Our Sites utilize cookies for several purposes, including the storage of information required to determine how to properly deliver content to your computer or device. A cookie is provided to all visitors to fitokgroup.com, regardless of whether you register with an authorized sales and service center.
For users who do register with an authorized sales and service center, a profile containing the registration information is generated by our website, and used for several purposes:
  1. to match you with content that is associated with your interests and to direct you to additional resources and tools that can save you time;
  2. to enable a fast response for service or follow-up request from our website;
  3. to verify your identity;
  4. to send you an electronic newsletter, other information and content; and
  5. to contact you when necessary.
What kinds of cookies do we use?
We may use cookies for a number of purposes:
  1. Session Cookies These cookies are used 'in-session' each time you visit and then expire when you leave a Site or shortly thereafter.  They are not stored on your computer or device permanently, do not contain any personal data and help by minimizing the need to transfer personal data across the internet. These cookies can be deleted or you can refuse to allow their use, but this will hamper the performance and your experience in using the Sites. These cookies also take time stamps that record when you access the Sites and when you leave the Sites.
  2. Tracking Cookies – These cookies enable us to recognize repeat visitors to the Sites. By matching an anonymous, randomly generated identifier, a tracking cookie keeps track of where a user of the Sites came from, what search engine they may have used, what link they clicked on, what keyword they used and where they were in the world when they accessed the Sites. By monitoring this data, we can make improvements to the Sites.
  3. Persistent Cookies – This type of cookie is saved on your computer or device for a fixed period (sometimes for a few hours, sometimes for a year or longer) and is not deleted when the browser is closed. Persistent cookies are used where we need to remember who you are for more than one browsing session. For example, this type of cookie can be used to store your preferences, so that they are remembered for the next visit to the Sites.
  4. Performance or Analytical Cookies Performance cookies are used to analyze how the Sites are used and to monitor their performance, which allows us to improve your experience in using the Sites. These cookies help us to tailor the content of the Sites to reflect what the Site users find most interesting and to identify when technical issues with the Sites arise. We may also use this data to compile reports to help us to analyze how Sites are used, what the most common issues are and how we can improve the Sites.
Can the Cookies be blocked?
Yes. Most internet browsers are initially set up to automatically accept cookies. You can, however, change your browser settings to block cookies or to alert you when cookies are being sent to your device. There are a number of ways to manage cookies. Please refer to your browser instructions or help screen to learn more about how to adjust or modify your browser settings. Instructions for blocking or allowing cookies in popular web browsing software can be found by clicking the following links:
Internet Explorer
Google Chrome
Microsoft Edge
Please be aware that if you disable the cookies that we use, this may impact your experience while on the Sites. For example, some features and services on the Sites may not work properly because we may not be able to recognize and associate you with your FITOK account(s). In addition, the offers we provide when you visit us may not be as relevant to you or tailored to your interests.