The Hallite 511 is a loaded U cup utilising a polyurethane or polyester shell energised by a high specification resilient O ring.

At zero or low pressure, the O ring helps to increase the sealing force preventing any bypass. As pressure rises the sealing force increases and the O ring ensures complete lip actuation under most conditions.

The symmetry of the seal allows it to be used on both rod and piston applications and its flexibility enables easy installation. Ideally suited for single acting applications, the Hallite 511 can also be fitted back to back for use in double acting applications.

•  Flexible for easy installation
•  Excellent resistance to abrasion
•  Positive lip actuation
•  Knife trimmed precision sealing lips
•  Compact housing
•  Wide range of size

Seal material – O-ring Standard Material:

Polyurethane (Black) – NBR Last digit of part no. 10
Polyester – NBR Last digit of part no. 11
Polyester – FKM Last digit of part no. 12
Hallite 361 TPU – NBR Last digit of part no. 16

For further information about the different 511 material variants we supply, please contact your local Hallite sales office.

  • Unit of measurement:
Unit of measurement:

Max pressure

350 Bar

Temp range


Max speed

  • Recomended
  • Possible
  • Not Suitable

* For fluid types marked as possible, please call our team of experts on +1 248 668 5220 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) Not suitable Not suitable
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