The Hallite 155 U-ring static seal designed to seal the joint between the gland and the cylinder bore. The Hallite 155 replaces the conventional O-ring and back-up ring combination.

Through its special design and polyester material compound, the seal will work with a maximum extrusion gap of 0.40 mm at 500 bar pressure.

Every nominal diameter of the Hallite 155 is suitable for a range of bore diameters, ØD₁. See part number range for details.

This seal was developed for water-based, HFA, applications, but can also be used with standard mineral oil fluids.