Heavy-Duty Rod U-Cup Seal with Full-Face Backup Ring

Series 135: Heavy-Duty Rod U-Cup Seal with Full-Face Backup Ring

The 135 Series U-cup seal is a popular choice to replace older style V-packing sets. It is a high-performance, double-lipped seal for use as in high-clearance applications, typically in moderate to high-pressure environments. Its full-face backup ring encapsulates the seal to add stability under high-pressure conditions, while preventing extrusion. The asymmetrical design of the U-cup ensures the lip forces are optimized for every cross section and diameter. Manufactured in a variety of materials and sizes from 6 mm up to 2100 mm in standard or custom diameters.



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 135 Series U-cup seal is typically used in high-clearance applications as a primary seal and functions well in moderate to high pressures. It is a popular choice to replace V-packing sets.

Typical Applications

  • Steel and aluminum processing
  • Mining
  • Agriculture
  • Construction equipment
  • Presses
  • Injection molding machines


The 135 Series rod seal features high-grade polyurethane. Standard materials are MP03 machined H-PU, available up to 2100 mm in diameter. 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, PTFE with bronze filler and PEEK.

Material Code
Polyurethane H-PU / POM MP30
Hydrogenated NBR-PTFE/Bz MN32
Temperature MP30

hydraulic oil -20…+115 -5…+240
water oil emulsions (HFA) +5…+55 +40…+130
water-glycol fluids (HFC) -20…+55 -5…+130
polyol esters (HFD) - -
water +5…+55 +40…+130
speed 0.5m/s (1.6 ft/sec)
pressure <1380 bar (20000 psi)

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