Symmetrical Rod Seal U-Cup

Series 122: Symmetrical Rod Seal U-Cup

The 122 Series U-Cup can be used as either a dirt exclusion device or primary sealing device. The design features a primary sealing material that is further energized by an elastomeric element, frequently an O-Ring. This allows a high sealing force to be created at the sealing lips and combined with sharp cut lips, assist in the removal of dirt and debris. This versatility allows this seal to be used across many markets. manufactured in a variety of materials and sizes from 6 mm up to 2100 mm in standard or custom diameters.



High pressure capability and wide temperature range

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

Exceptional abrasion resistance

Highly extrusion resistant

Available in diameters up to 2100 mm


The 122 Series U-Cup is used in applications requiring high sealing and wiping forces. This seal is available in a wide range of materials to cover applications where specialty fluids are present. The seal is a symmetrical design allowing use as either dynamic OD or ID sealing. Generally the seal has been superseded by more advanced designs and it is recommended to consult with engineering to avail of more modern designs.

Typical applications include:

  • Mobile Hydraulics
  • Hydraulic Cylinder Rebuild
  • Agricultural Hydraulics
  • Construction Equipment
  • Hydraulic Presses
  • Injection Molding Machines

The 122 Series rod seal features high-grade polyurethane. Standard materials are MP03 machined H-PU, available up to 2100 mm in diameter, and MP50 injection-molded TPU. To suit a variety of applications, the series is also available in NBR, H-NBR, EPDM and high temperature-resistant FPM.

Material Code
Polyurethane H-PU MP03
Polyurethane TPU MP50
Temperature MP03


hydraulic oil -20…+115 -5…+240 -30…+110 -20…+230
water oil emulsions (HFA) +5…+55 +40…+130 +5…+50 +40…+120
water-glycol fl uids (HFC) -20…+55 -5….+130 -30…+40 -20…+100
polyol esters (HFD) - - - -
water +5…+55 +40…+130 +5…+50 +40…+120
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.