Sealing rings are designed as contact seals. They protect the bearing position against contamination, spray water and the excessive loss of grease.

Sealing rings are matched to the small radial dimensions of drawn cup needle roller bearings and needle roller bearings. They are very easy to fit, since they are simply pressed into the housing bore.

Sealing rings allow circumferential speeds at the seal lip of up to 10 m/s, depending on the surface quality of the shaft.

Sealing rings G and GR are single lip seals made from synthetic NBR elastomer (colour: green).

The design GR is suitable for shaft diameters up to 7 mm as standard and has an external steel reinforcement for stiffening purposes.

Sealing rings G are suitable for shaft diameters over 8 mm and have a rubber-encased steel reinforcement for stiffening purposes with a wave-shaped rubber profile. This provides good sealing on the outside diameter. At the same time, it also reduces the forces required for fitting.

Sealing rings SD have a contact lip and a non-contact dust shield lip facing the shaft (on the marked side). They comprise two plastic components.

The seal carrier is made from reinforced polyamide (colour: black), while the seal lip area is made from thermoplastic PU elastomer ­(colour: green).

Sealing rings SD can also be used as wipers on shafts with axial motion. Stroke speeds up to 3 m/s are possible, dependent on the condition of the shaft.

The permissible temperature is dependent on the interaction between the medium and the temperature and its effect on the sealing ring material. The suitability of the sealing rings should be checked by tests as extremes of operation are approached.

Sealing rings G and GR are suitable for operating temperatures from –30 °C to +110 °C, depending on the medium acting on the sealing ring.

Sealing rings SD are suitable for operating temperatures from –30 °C to +100 °C, depending on the medium acting on the sealing ring.

Suffixes for available designs: see table. 

Further information on sealing rings and the basic principles of sealing ring technology is given in TPI 128, Sealing rings, single lip and double lip.