Characteristics and performance

The Hallite 775 double-acting piston seal is a compact seal for light to medium-duty applications and designed to fit two housing standards; one for standard O-ring grooves, the second for grooves designed for an O-ring and two back-up rings. The advanced face geometry gives the Hallite 775 single-acting capabilities making it an excellent choice for double-acting applications where minimal dynamic leakage is required.

Comprised of a tough polyurethane face seal which is pre-loaded by a rectangular cross-section NBR expander, the standard material is suitable for hydraulic mineral oil applications.

Product details

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Product specification
Operating conditions
Fluid compatibility

Metric Inch

Max pressure *

350 Bar

Temp range

-30°C

110°C

Max speed

1m/sec

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

Key:

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

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775 – advanced face geometry double acting piston seal

The Hallite 775 can be used on SG iron pistons or on pistons where there is an adequate remote bearing, such as the Hallite 506, 533, and 87 bearings.