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For the external sealing of rotating shafts

Gamma-Rings serve as pre-sealing for the outer sealing of rotating shafts against contamination, granules, dust, oil, grease, liquids etc. and com bine the function of a contactless centrifugal gasket as a gap seal as well as an axially fitting rubber sleeve gasket. The sleeve consisting of different rubber qualities is produced with a corresponding radial pre-stressing integrated into the housing. The device built in that way is then attached to the shaft with a press fit, so that the rubber lip rests on the counter surface.


Profile Design Material Hardness (Shore A) color Max. pressure in Mpa (bar) Temperature (°C)/ temporarily
RM NBR 80 black 10 -30 to +100/+120
RM FKM 75 brown 12 -20 to +200/-25
9RM NBR 80 black 10 -30 to +100/+120
9RM FKM 75 brown 12 -20 to +200/-25

Description Gamma Rings

Gamma-Rings without rubber cuff (flinger disc)

Gamma-Rings with rubber cuff

Gamma-Rings with rubber cuff and collar

Our Gamma rings are available as sealing rings in various housing materials such as anodised sheet steel, nickel-plated sheet steel or stainless steel. The different elastomers create a multitude of possible combinations for these seals.

Advantages of the gamma rings

  • protection of the sealing lip against mechanical impact
  • low mounting width
  • good centrifugal effect
  • low requirements with regards to the counter surface (surface hardness, tolerance of thrust surface)
  • straightforward mounting
  • no additional retaining fixture necessary
  • improved longevity for bushings and shaft seals

Applications of the Gamma-Rings

Gamma-Rings are mainly used in combination with shaft seals. They are used as modular upstream sealing element to seal against dirt, dust, oil and water splashes from the outside.

Fields of application of the gamma rings

Gamma-Rings have been successfully used for many years in drive engineering and in mechanical engineering, e.g. with electric motors, transmissions, pumps, motor saws, drive shafts, wheel hubs and axles, in agricultural machinery, construction machinery, machine tools, rolling bushing housings and washing machines.
Designation Pressure Temperatur Range CIRCUMFERENTIAL SPEED
NBR Construed for pressure-free operation -40°C   +120°C <_ 12 m/s
FPM Construed for pressure-free operation -20°C   +200°C 10 m/s

The above mentioned parameters are maximum values and must not be placed simultaneously side by side as they are dependent on the other operating parameters.

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Whether agricultural machinery, construction machinery, forestry technology, drive technology, mechanical engineering, automotive or aerospace, we are ready for your challenges. With our engineering solutions, we manage to offer added value in all decisive product parameters through solutions developed specifically for customers and applications. Get to know our competence and best examples in the most diverse markets.