Mill-Duty Static Seal

Series 161: Mill-Duty Static Seal

The 161 Series is a great replacement for standard large-diameter O-rings. This heavy duty static seal has a defined sealing lip manufactured from high-performance polyurethane. The square body profile prevents rolling in the groove, which is common with O-rings. The robust qualities of polyurethane allow the seal to be used without a backup ring.



No twisting or rolling during installation

Direct retrofit to O-Ring and backup ring designs

Extrusion resistant

Abrasion resistant polyurethane

Long life due to robust design


The 161 Series is used as the primary static seal in heavy duty steel and aluminum applications in severe conditions.

Typical applications include:

  • Steel and Aluminum Processing
  • Mobile Hydraulics
  • Hydraulic Cylinder Repair
  • Agricultural Hydraulics
  • Construction Equipment

The 161 Series Static Seal features high-grade polyurethane. Standard materials are MP03 machined H-PU, available up to 2100 mm in diameter.

Material Code
Polyurethane H-PU MP03
Nitrile NBR MN01
Fluroelastomer FPM MF01
Hydrogenated NBR MN03
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 static
Pressure 400 bar (6000psi)

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