Heavy-Duty, Four-Piece Piston Seal

Series 254: Heavy-Duty, Four-Piece Piston Seal

The 254 Series is one of the most robust four-piece piston seals available on the market. It consists of a profiled energizer, a PTFE-filled seal element and two active anti-extrusion backup rings. It is designed for double-acting cylinders in heavy-duty applications subject to severe pressure spikes coupled with high running clearance.



Long service life under the harshest conditions

compatible with water-base fluids

Optimized for high running clearance

Easy installation


The 254 Series, four-piece piston seal is ideal for heavy duty sealing applications where pressure spiking can occur.

Typical Applications

  • Forging presses
  • Extrusion presses
  • Stamping presses
  • Mining
  • Specialty high-pressure cylinders
  • Various advancing and secondary cylinders



The 254 Series piston seal features a robust NBR elastomer, a seal cap in low-friction PTFE-filled and two backup rings in high-strength thermoplastic.

Material Code
PTFE-Bronze compound / NBR / POM MT24
Temperature MT24

hydraulic oil -30…+100 -22…+212
water oil emulsions (HFA) - -
water-glycol fluids (HFC) - -
polyol esters (HFD) - -
water - -
Speed 1.5 m/s (5 ft/sec)
Pressure 500 bar (7250 psi)

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