The Hallite 657 flange seal is designed to fit SAE J518 flanges.

The Hallite 657 overcomes high pressure and shocking loading which commonly cause pumping problems when using O-rings in flange sealing applications preventing reliable sealing.

The Hallite 657 is moulded in Hythane® 181, Hallite’s high-performance polyurethane, for easy installation and excellent low temperature performance. The Hallite 657 is also offered in an industrial standard grade of polyurethane.

Also listed are two non-SAE seal sizes for metric flanges.

  • Unit of measurement:
Unit of measurement:

Max pressure

600 Bar

Temp range

  • 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 Not suitable Recommended
Waterbased fluids    
HFA (5/95) Not suitable Possible
HFB (60/40 invert emulsion) Not suitable Possible
HFC (water glycol) Not suitable Possible
Water Not suitable Possible
Other fluid types    
Air/Nitrogen Not suitable Possible
HFD (Phosphate ester ARYL Type) Not suitable Not suitable
Synthetic esters (HEES, HFDU) Not suitable Recommended