Parker Prädifa Piston Seals EK

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The single-acting Parker Prädifa pneumatic complete piston DE is a two-component seal design, consisting of a metallic carrier with a vulcanized guiding surface and sealing lip. The complete piston performs two functions: sealing and guiding.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Immediate response (full pressure load) thanks to incorporated venting channels.
  • Good wear resistance.
  • Ideal corrosion protection thanks to complete elastomer covering.
  • Smooth running due to the optimum lubricant-retaining sealing lip geometry.
  • Easy attachment to the piston rod without additional sealing elements.
  • Easy installation due to integrated static sealing function.
  • Excellent media resistance in case of suitable compound selections.
  • Also available as a double-acting version.
  • The low assembly height of the complete piston enables the short cylinder designs.
  • Versatile complete piston for nearly all cylinder designs.

Range of application

Complete piston for single-acting pneumatic cylinders with and without end position cushioning, provided that no excessive lateral guidance loads will occur (long strokes and buckling).

Operating pressure ≤ 16 bar
Operating temperature -30 °C to +80 °C
Sliding speed ≤ 1 m/s
Media Compressed air, both lubricated and oil-free (after greasing for fitting)


The standard compound is an elastomer (NBR-based) with a hardness of approx. 71 Shore A and vulcanized to a metal disc, resp. 78 Shore A for diameters > 100 mm.


The Parker Praedifa profile EK complete piston is fixed to the piston rod with a locknut to avoid loosening. For use with dry and oil-free air, the piston and cylinder tube must be relubricated with a suitable long-life lubricant.

It must be assured that the sealing lips do not touch the cylinder bottom and the cylinder cap at the limit stops (see also dimension „Ø dm“).

D d H Order code
25 8 7.9 EK2508Z5051
32 8 10.65 EK3208Z5051
40 10 12.4 EK4009Z5051
40 14 13.4 EK4014Z5051
50 10 12.8 EK5010Z5051
50 14 13.4 EK5014Z5051
50 16 14 EK5016Z5051
63 27 14.1 EK6332Z5051
80 12 15.2 EK8013Z5051
80 16 15.2 EK8016Z5051
80 27 15.35 EK8027Z5051
125 20 17.6 EKC520Z5050
140 22 19.6 EKE022Z5050
200 27 24.55 EKL027Z5050




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