The Hallite 660 single-acting rod buffer seal is designed to be used in conjunction with high-performance rod seal, such as the Hallite 605, 663, or 673, to protect the primary seal from shock pressure loading and high frequency pressure spikes in the hydraulic system. The design allows oil to pass through to the rod seal while holding back pressure spikes. The Hallite 660 design also allows pressure to pass back into the system preventing a pressure trap between the rod seal and the buffer seal. The Hallite 660 is an excellent pressure buffer option in heavy-duty applications and offers extended sealing system life and performance.

The Hallite 660 is also interchangeable with common PTFE buffer seal housings.

The Hallite 660 is moulded in Hythane® 181, Hallite’s high-performance polyurethane, for easy installation and excellent low temperature performance.

The design also incorporates a polyacetal anti-extrusion ring to provide maximum extrusion resistance against shock pressure loads.

  • Unit of measurement:
Unit of measurement:

Max pressure

700 Bar

Temp range


Max speed

  • Recomended
  • Possible
  • Not Suitable

* For fluid types marked as possible, please call our team of experts on (02) 9620 7300 to talk through your requirements and determine if this seal is the most suitable for your needs.

  Dynamic application Static application
Fluids based on mineral oil    
Any Recommended Recommended
Waterbased fluids    
HFA (5/95) Possible Possible
HFB (60/40 invert emulsion) Possible Possible
HFC (water glycol) Possible Possible
Water Possible Possible
Other fluid types    
Air/Nitrogen Possible Possible
HFD (Phosphate ester ARYL Type) Not suitable Not suitable
Synthetic esters (HEES, HFDU) Recommended Possible