Piston Seal U-Cup – Asymmetrical – AE Ring



High pressure capability and wide temperature range

Pressure-relieving design prevents pressure trapping

Excellent fluid compatibility including water-based fluids (H-PU)

Exceptional abrasion resistance


The 227 Series piston seal is typically used in heavy-duty applications, where pressure trapping, high pressure and large extrusion gaps exist.

Typical Applications

  • Steel and aluminum processing
  • Mobile Hydraulics
  • Hydraulic Cylinder Rebuild
  • Agricultural Hydraulics
  • Construction Equipment


The 227 Series piston seal features high-grade polyurethane. Standard materials are MP03 H-PU and polyacetal backup ring. To suit a variety of applications, the series is also available in NBR, H-NBR, EPDM and high temperature-resistant FPM. The backup ring materials include POM and PEEK.

Material Code
Polyurethane H-PU / POM MP30
Polyurethane TPU / POM MN30
Temperature MP03
hydraulic oil -20…+115 -5…+240
water oil emulsions (HFA) +5…+55 +40…+130
water-glycol fl uids (HFC) -20…+55 -5….+130
polyol esters (HFD)
water +5…+55 +40…+130
Speed 0.5 m/s (1.6 ft/sec)
Pressure 400 bar (6000 psi)

Note:for other materials or fluids please contact our engineering department.

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Learn more about System Seals

Download the System Seals Steel and Metal Processing catalog to learn more about our proprietary seals and how we help steel and aluminum mills save millions of dollars in uptime and productivity.