HRS MA24 - U-rings

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

Rod 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


The HRS MA24 is a single function piston rod seal in the form of a U-ring. Due to its asymmetrical sealing lips with a slightly indented outer lip edge, the pressure is guided outwards to strengthen its sealing function 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 HRS MA24, from an inner diameter of 25 mm and thin profile can always be installed in cut housing. With an inner diameter of less than 25 mm, we recommend axially accessible housing. To push the cylinder head and seal over the piston rod 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)
5 0.2
10 0.15
11 0.1

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.