Type AO

Product group:
Rotary shaft seal
A = outer surface rubber-coated
O = without spring and with grooved outer surface
NBR 70
black, green


Operational application limits

Pressure (Mpa/bar): 0/0
Temperature (°C): -40 to +100
Peripheral speed (m/s): ≤ 12


Good chemical resistance to various mineral oils and greases.


The AO / BO / are single-action rotary shaft seals for rotating or pivoting shafts. The sealing lip design without a spring produces less friction. As a result, the sealing action in comparison to rotary shaft seals with energised springs is reduced. The elastomer outer sheath provides good static sealing, good thermal expansion balance e.g. in light-metal housings, better sealing with greater roughness and secure sealing for split housings as well as good static sealing with thin fluid or gaseous media.

Tight and accurate fitting is achieved by the metal outer casing. The WBO model has limited sealing action with thin fluid or gaseous media and in split housings. To guarantee a high level of static sealing on the outer surface, better surface treatment of the housing bore is necessary.


Suitable tools should be used for installation. It is recommended that the installation housing is designed to provide the rotary shaft seal with axial support.


Secondary sealing e.g. as a dust, dirt or spray protection seal in electric engines, as a grease retainer.