Single-Acting Piston Seal

Series 281: Single-Acting Piston Seal

The 281 Series Single-Acting Piston Seal is a low-friction design, consisting of a PTFE filled seal and an O-ring energizer. It is designed for single-acting cylinders in challenging applications, where low friction and high wear resistance are needed.



High-temperature resistance

Low wear

Extrusion resistant

Compatible with a wide range of media

Available in diameters up to 2100 mm


The 281 Series Single-Acting Piston seal is ideal for high-pressure sealing applications, offering low-friction performance and single-acting operation.

Typical applications include:

  • Rolling Mills
  • Injection Molding Machines
  • Agricultural Hydraulics
  • Hydraulic Presses
  • Mobile Hydraulics

System Seal’s custom blended PTFE filled compounds provide ultra-low friction and high-speed performance with minimal wear. The standard compounds are PTFE filled with Bronze filler, or PTFE filled with Glass-Moly. The temperature range of the seal can be increased by selecting an FPM energizer in place of the standard NBR energizer.

Material Code
PTFE Bronze Compound + NBR O-ring MT23
PTFE Bronze Compound + FPM O-ring MT26
PTFE Glass MoS2 Compound + NBR O-ring MT83
PTFE Glass MoS2 Compound + FPM O-ring MT86
Temperature MT23


hydraulic oil -30…+100 -22…+212 -30…+100 -22…+212
water oil emulsions (HFA) -…- -…- +5…+60 +40…+140
water-glycol fl uids (HFC) -…- -….- -30…+600 -22…+140
polyol esters (HFD) - - - -
water -…- -…- -5…+100 +40…+212
Speed 5 m/s (16.5 ft/sec)
Pressure 400 bar (6000 psi)

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