Ermeto Bite Type Fittings Introduction:
The bite type fitting was designed by Ermeto in Germany in the early 1930’s. Ermeto-fittings soon became popular due to the simple assembly which basically just requires two wrenches. Today, the EO fitting is the most widely used bite-type fitting in the world. EO fittings are designed for metric tube. All threads, hexagons, bores and other dimensions are purely metric. Historically it is based on German national standards 2353, DIN 3861, DIN 3859 and DIN 2353, which today are represented in the international standards ISO 8434. EO fittings are recognized for the high pressure performance from a compact body. EO fittings are available in the three series for low, medium and high pressures (LL, L and S-Series). This allows cost savings and -space minimized solutions for each specific application. New Generation:
High performance tube fittings
The new, chromium6-free fitting generation from Parker Ermeto is called EO-Plus for metallic sealed connections, EO2-Plus for Dry Technology systems and EO2-FORM for formed tube soft-sealed systems without cutting rings. The new generation is characterized by maximum safety even under extreme pressures of up to 800 bar nominal pressure.
The further development of the proven Dry Technology EO-2 concept is designated EO2-Plus and gives extremely high pressure ratings and greatly reduced tightening torques for the larger fitting sizes. EO2-FORM is the new high pressure tube connection from Parker Ermeto. This concept unites the advantages of welded connections with those of EO-2 technology proven worldwide in millions of applications.
The New Generation from Parker Ermeto clearly exceeds the performance requirements of DIN/ISO standards: with its guaranteed 4-fold design factor, the new fitting generation can be used at the following nominal pressures in steel:
- Up to 500 bar in the L series
- Up to 800 bar in the S series
- A unique 420 bar in the 20 S–38 S sizes
This extraordinary pressure and assembly performance can only be achieved by the use of even better and more resistant materials in combination with a special coating of individual components. This greatly extends the application range and the user does not have to sacrifice any advantages. Thanks to the higher pressure levels, less expensive “L” series fittings can now be used instead of the heavier “S” series.
The new multifunctional PSR cutting ring, the heart of the EO-Plus fitting, ensures a uniquely simple and easy assembly through its multifunctional ring geometry.
The new high performance forging design with its considerably larger flats size makes assembly even safer and easier. Through the application of a chromium6-free surface treatment, Parker Ermeto meets future requirements of the automotive industry today, and respects the directive of the European Parliament to eliminate the use of Chromium6. The removal of Chromium6 reflects Parker’s ongoing commitment to an environmentally clean and safe production process. The additional “Plus”: the corrosion resistance is increased to more than 500 hrs. to white rust.
The EO-LUB procedure is yet another innovation unique to Parker. In addition to the standard dry wax lubrication of the tube nuts, all larger fittings (25S/28L and above) are EO-LUB treated. EO-LUB reduces the assembly torques by approximately 25%, which makes assembly easier and prevents under assembly, the most common reason for bite-type tube fitting failure. This latest fitting generation benefits from Parker’s long years of experience combined with continuous innovation. It is made with our state-of-the-art production methods, controlled by the strictest quality assurance systems and procedures.