The Hallite 512 is a standard profile loaded U cup utilising a polyurethane or polyester shell energised by a high specification O ring.

At zero or low pressure, the O ring helps to increase the sealing force, preventing any by-pass. As pressure rises, so the sealing force increases, with the O ring ensuring complete lip actuation under most conditions.

The deep profile of this seal provides extra stability needed to resist rolling in the groove and together with the knife trimmed precision sealing lips, the results are improved life and sealing. The 512 can be used for single acting applications or fitted back to back for double acting applications. Although it can also be used as a rod seal, other profiles like 513, 606 or 621 are a better option.

•  Flexible for easy installation
•  Excellent resistance to abrasion
•  Positive lip actuation
•  Deep profile for stability
•  Wide range of sizes and material options

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 512 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 +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) 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