The Turcon® Double Delta® is a double-acting sealing element which is energized by an elastomer O-Ring. The Turcon® Double Delta® seal can be fitted in existing O-Ring grooves (US standard AS 568 A, MIL-P-5514) and demonstrates good friction properties, stick-slip free starting and excellent dry-running. The Turcon® Double Delta® is used in light and medium-duty industrial hydraulics.


Turcon®Double Delta® is a rubber energized plastic faced seal, designed to expand and significantly improve the service parameters of O-rings. Double Delta® can be installed in existing O-ring  grooves. Double Delta® combines the flexibility and responsiveness of O-rings with the wear and friction characteristics of the Turcon® materials in dynamic applications.


The double-acting performance of the seal follows from the symmetrical cross section which allows the seal to respond to  pressure in both directions.


Initial contact pressure is provided by radial compression of the O-ring. When the system pressure is increased the O-ring transforms this into additional contact pressure, the contact pressure of the seal is thereby automatically adjusted so sealing is ensured under all service conditions.



Pressure: up to 35 MPa

Speed: up to 15 m/s

Temperature: -45 °C to +200 °C according to O-ring material 

Media: Mineral oil-based hydraulic fluids, flame retardant hydraulic fluids, environmentally friendly hydraulic fluids (bio-oils), phosphate ester, water and others, depending on temperature, seal and O-ring material compatibility.

Clearance: The maximum permissible radial clearance Smax is shown in Table 87, as a function of the operating p



  • Compact groove dimensions and simple installation
  • Low friction without stick-slip
  • Resistance against wear and extrusion
  • Rod seals available for all diameters from 2 to 999.9 mm
  • Standard cross sections cover AS 568a and important metric O-rings, other cross sections available on request.
  • Fits also groove dimensions per ISO 6194 and AS 4716