HPS MA23 - U-rings

Type/Ref.: Piston seal
Pressure (bar): 16/160
Temperature (°C): –30 to + 100
Running speed (m/s): = 0.5

Piston seal with asymmetrical sealing lips which are cut at an angle of less than 45°.

Standard material

Area of application
Hydraulics and pneumatics
reciprocating movements


he HPS MA23 is a single function piston seal in the form of a U-ring. Due to its asymmetrical sealing lips with a slightly indented outer lip edge, the energising is guided outwards to strengthen its sealing function also at low pressure.


Hydraulic oils acc. DIN 51524/51525,
lubricating oils, mineral oil based
lubricating fats, non-flammable
hydraulic fluids HFA, HFB, HFC acc.
VDMA 24317.

Operational application limits

Pressure (MPa/bar): 16/160
Temperature (°C): –30 to + 100
Running speed (m/s): = 0.5


The HPS MA23 can be installed in cut housing. To push the piston body and seal into the cylinder pipe without damaging it, a lead-in chamfer C acc. to the following table is required:

Profile width (mm) Lead-in chamfer C (mm)
4 2
5 2.5
7.5 4
10 5
12.5 6.5
15 7.5
20 10
25 10

If the housing is provided with a metallic fitting on the side opposite the pressure, the service life of the seal is lengthened. Within the operating parameters given above, depending on the pressure, a metallic wedge can be fitted between the cylinder pipe and piston acc. to the following table:

Pressure (MPa) Radial wedge G (mm)
8 0.1

The piston diameter d1 should generally be by factor 0.65 of the profile smaller than the DN diameter provided.

Please also follow the general installation instructions.


In addition, we are able to supply other dimensions required. For operating conditions other than the standard applications, further elastomers are available.