RS WCP20 - Rotary shaft seals

Type/Ref.: Rotary shaft seals
Pressure (bar): SP1 5 bar / SP2 10 bar / SP3 25 bar
Temperature (°C): -90 to +250
Peripheral speed (m/s): ≤ 40 (noting p x V factor)

Rotary shaft seal with a PTFE sealing lip and an elastomer pre-tension ring which is clamped between two metal cages. Non-mould production.

Standard materials

Sealing lip: PTFE + fibreglass/MoS2 Colour: grey
Metal cages: steel 1.4404 (AISI 316L) Elastomer ring: FKM

Areas of application

Sealing of rotating machine elements, such as shafts, hubs and axles at high peripheral speeds, high pressures and/or high temperatures. Sealing of aggressive chemicals due to the excellent chemical resistance of PTFE. For dry operation or applications with insufficient lubrication due to the very good friction coefficient of PTFE.


The RS WCP20 is a single action rotary shaft seal for rotating or pivoting shafts with a very long lifespan. Good sealing action is guaranteed by the pre-stressed PTFE sealing lip on the shaft. The very low friction coefficient of the PTFE material prevents a stick-slip effect, lowers the starting resistance and is therefore also a good choice for dry operation or applications with insufficient lubrication. The RS WCP20 can be used at high peripheral speeds as limited thermal development occurs. It is suitable for larger pressure loads, optionally 5/10/25 bar.

Tight and accurate fitting is achieved by the metal outer casing. The RS WCP20 design has limited sealing action with thin fluid and gaseous media and in split housings. To guarantee a high degree of static sealing on the outer surface, better surface treatment of the housing bore is required or an additional coat of paint should be applied to the metal outer casing.


All types of oil, water, water/oil emulsion, hot air, broadest chemical resistance to almost all aggressive media.

Operational application limits

Pressure (Mpa/bar): SP1 5 bar / SP2 10 bar / SP3 25 bar
Temperature (°C): -90 to +250
Peripheral speed (m/s): ≤ 40 (noting p x V factor)


The outer diameter of the metal outer casing is centralised in the housing by press-fitting. The installation housing tolerances are in accordance with those in DIN 3760. 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. The PTFE sealing lip must not be damaged during installation. For this reason, we recommend using an installation cone. Please also refer to our general installation instructions for the RS WCP20 on page 25 of this catalogue.


The nominal widths mentioned on the following pages represent the standard dimensions.

Other dimensions and different designs, e.g. dust protection lip or metal cages made of other steel grades can be produced as well as some special designs.

Thanks to the non-mould production, delivery at short notice and small quantities are possible.