In the 1930s in Germany, the company Ermeto Armaturen developed the first bite-type fittings (cutting ring) as a reliable solution for high-pressure hydraulic systems, especially in industrial and mobile machinery.
The goal was to achieve a secure, vibration-resistant, and easy-to-assemble connection without the need for welding. This system was later standardized under DIN 2353and became the fitting type used worldwide.
Ermeto Armaturen was integrated into the Parker Hannifin organization in the 1980s. By then, other manufacturers of bite-type (cutting ring) fittings already existed. Taking a step forward, Parker introduced the EO-2 system, which has since set itself apart as the most effective and easiest to assemble solution on the market.
The Parker EO-2 fitting system offers superior sealing, faster assembly, and greater reliability compared to conventional fittings based on DIN 2353.
What is the Parker EO-2 system?
The EO-2 system is a range of metric hydraulic fittings that comply with the international standard ISO 8434-1 (formerly DIN 2353). It is designed to provide secure, leak-free tube connections across a wide variety of industrial applications.
The key difference compared to traditional fittings is the incorporation of elastomeric seals at every connection, ensuring a tight seal even under high-pressure or vacuum conditions—something that classic cutting-ring or all-metal systems do not always achieve as effectively.
Key features and advantages of the EO-2 system
✔️ Leak-free sealing
Thanks to integrated elastomeric seals at all joints, EO-2 fittings virtually eliminate potential leak paths. This results in cleaner, more efficient hydraulic systems with no need for retightening over time.
✔️ High pressure capability
EO-2 fittings are designed for high-pressure applications, with ratings of up to 800 bar in the S series and 500 bar in the L series, covering most demanding hydraulic applications.
✔️ Fast and secure assembly
The functional nut design and seals make assembly more intuitive and faster than traditional systems. In addition, the risk of under-tightening is reduced thanks to clearly perceptible stop points during tightening.
✔️ Air ingress prevention in vacuum systems
The static compression of the seals also helps prevent air from entering systems operating under vacuum conditions—an important factor for maintaining reliability in sensitive processes.
✔️ Versatility and durability
Available in steel or stainless steel, with NBR or FKM seal options, EO-2 fittings offer chemical and thermal resistance as well as long-term durability, even in extreme conditions.
Where are EO-2 fittings used?
The EO-2 system is widely used in sectors such as:
Industrial and mobile hydraulics
Heavy machinery equipment
Manufacturing and automation processes
Fluid and gas transfer systems
Applications with strict sealing requirements
These applications demand consistent, leak-free performance—this is where EO-2 clearly stands out from other systems.
Why choose the EO-2 system?
As Parker distributors, we offer the EO-2 range because it represents a significant technological advancement in DIN 2353 fittings. It not only provides reliable sealing and fast assembly, but also reduces maintenance time and leak risks, helping your fluid systems operate more efficiently and safely.
If you are still using traditional fittings and need to improve the reliability of your installations, the Parker EO-2 system is an option worth considering.
Would you like advice on which EO-2 fittings best suit your installation? Contact us and we’ll help you choose the ideal solution.
