Symmetrical piston/rod seals are designed to seal the pressurized hydraulic fluid against the atmosphere or between two pressurized spaces.


  •    Symmetrical, single acting piston/rod seal, no interference on the ID or OD.
  •    Preload effected through round Helicoil-spring which ensures high pressure on the sealing edges.
  •    Excellent static and dynamic sealing performance.
  •    Excellent sealing performance in low and high pressure ranges.
  •    Useable for short and long stroke lengths.
  •    Low friction in dry running or poor lubrication conditions.
  •    Also used for gas applications.
  •    Negligible tendency to “stick-slip” effect, small break away loads.


Reciprocating and swivelling pistons in hydraulic cylinders, plungers. Chemical and pharmaceutical industry, aggressive fluids and high temp. Max. pressure 160 bar, max. speed 5 m/s linear; 0,1m/s rotating.


Installation in open housing, snap-in installation possible in special designed housings.

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤2,5 ≤ 0.6
bottom of groove ≤6,3 ≤1,6
groove face ≤15 ≤ 4.0

tolerance recommendation

seal housing tolerances
Ød f7
ØD H11