Characteristics and performance

Hallite’s 656 is an asymmetric single acting piston seal. Similar in design to the Hallite 621 rod seal, Hallite’s 656 offers excellent sealing in light, medium and heavy duty single acting applications.

Manufactured in Hallite’s high performance polyurethane Hythane® 181, Hallite 656 is an extremely flexible seal making installation easy.

The twin lip design offers lower friction, improved sealing and primary lip protection.

Product details


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Max pressure *

400 Bar

Temp range


Max speed


* Max pressure stated is dependant on the material variant selected. Please consult the datasheet for further information.

  • Recomended
  • Possible
  • Not suitable

* For fluid types marked as possible, please call our team of experts on +44 208 941 2244 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) Recommended Recommended
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