Rod U-Cup Seal with Full-Face Backup Ring

Series 137: Rod U-Cup Seal with Full-Face Backup Ring

The 137 Series U-cup seal is a high-performance, double-lipped seal for use in high-clearance applications, typically in moderate to high-pressure environments. Its asymmetrical design ensures that the seal lip forces are optimized for every cross section and diameter. The full-face backup ring supports the seal and ensures maximum extrusion resistance in a larger than normal clearance application. Manufactured in a variety of materials and sizes from 6 mm up to 2100 mm in diameter in standard or custom sizes.



Designed specifically for large clearance applications

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 137 Series U-cup seal is typically used in high-clearance applications as a primary seal and functions well in moderate to high pressures.

Typical Applications

  • Mining
  • Agriculture
  • Construction equipment
  • Presses
  • Injection molding machines

The 137 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. The backup ring materials include POM and PEEK

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.