Rotating shaft seals

Radial shaft seals and axial shaft seals for applications with rotational motion

  • Rotary shaft seals overview: Cassette seal and black WDR type A seal
  • Rotary shaft seals overview: Cassette seal and black WDR type A seal

The perfect fit between rotating and stationary components

Radial shaft seals and axial shaft seals are gaskets made in elastomer and/or plastic material, with or without metal inserts and energizing springs, to be applied on shafts with relative rotary motion. They are primarily used for drivelines, axles, agriculture machines and construction equipment, compressors and pumps, mixers, robotics, gearmotors and others.

Rotating seals are devices widely utilized to prevent any leakage or any exchange of media (pasty, liquid, and gaseous), to contain the pressure, and to exclude any contamination of dust, moisture, and dirt between two chambers that are subject to a relative either rotating or oscillating motion. But the primary sealing function is only one requisite an effective and reliably performing radial shaft seal needs to fulfill, as other features are essential too.
 

Application success with material knowledge

Be it either a rubber seal or a plastic seal, choosing the right materials can provide the proper chemical inertia against the media in contact, the correct physical performance against the working temperature and the working pressure, and the necessary tribological properties to withstand high tangential speed and strong abrasion. From NBR to FKM, HNBR, CR, ACM, AEM, PTFE-Polytetrafluoroethylene and Polyurethane – a wide range of elastomer compounds are available at Angst+Pfister for either lubricated or dry working conditions. And according to the application environment, different steel types can be used for the metal inserts and for the springs. 

It goes without saying that best solution for your sealing application can be achieved by making use of our highly specialized competence in the area of materials, specifically by optimizing the elastomer compounds, engineering plastic materials and metals used. Together with our engineering know-how for conceiving the most effective rotating seal design, this makes for a recipe for success!
 

Tackling your problems

Working pressure, tangential speed, dimensional constraints, working temperature, chemical composition of the media to be sealed, efficiency in low drag torque, and long endurance are all conditions that an effective solution needs to satisfy. Angst+Pfister has developed the specific expertise over a century of activities across the different OEM Industries to support you in defining the most suitable sealing solutions.

Angst+Pfister offers a comprehensive range of standard normalized sealing solutions shown in the table below, as well as the possibility of co-designing customized devices to fully meet even the most stringent customer’s requirements for harsh applications. Our engineering and product application specialists aim to provide leading-edge technology and valuable solutions for all your rotary shaft applications. Get in touch with us now!

 

Applications

  • Gearmotors / Gearboxes
  • Gear pumps and motors
  • Compressors and pumps
  • Driveline and axles
  • Spindles
  • Robotics
  • Agitators and mixers
 

Product List

Product Image Description Technical data Peculiar features Key applications  Order
        Material Hardness Colour

Temperature (°C)

Peripheral speed (m/s) Pressure rating (bar) Dust protection Low friction High speed and high T resistance Gearmotors & gearboxes Gear pumps & motors Compressors & pumps Driveline & axles Spindles Robotics Agitators and mixers  
Type A Standard radial shaft seal with sharply cut or pressed sealing lip and coated metal cage on the outside diameter. Good sealing effect with bearing oils and greases. NBR 70 Shore A black -40 to +100 14 <0.5       x Special high pressure versions only x x        
Type A Standard radial shaft seal with sharply cut or pressed sealing lip and coated metal cage on the outside diameter. Good sealing effect with bearing oils and greases. FKM 80 Shore A brown -20 to +200 37 <0.5     x x Special high pressure versions only x x        
Type AS Standard radial shaft seal with sharply cut or pressed sealing lip and coated metal cage on the outside diameter. Good sealing effect with bearing oils and greases. Design with additional dust protection lip. NBR 70 Shore A black -40 to +100 14 <0.5 x     x Special high pressure versions only x x        
Type AS Standard radial shaft seal with sharply cut or pressed sealing lip and coated metal cage on the outside diameter. Good sealing effect with bearing oils and greases. Design with additional dust protection lip. FKM 80 Shore A brown -20 to +200 37 <0.5 x   x x Special high pressure versions only x x        
Type SA Radial shaft seal with sharply cut or pressed sealing lip and coated metal cage on the outside diameter. Design without radial spring for lower radial forces. NBR 70 Shore A black -40 to +100 14 <0.5   x   x              
Type B   Radial shaft seal with sharply cut or pressed sealing lip and metallic stiffening ring on the outer surface. Good sealing effect with bearing oils and greases. Extremely precise positioning in the housing or location hole. NBR
FKM
        <0.5     FKM version only x              
Type C   Radial shaft seal with sharply cut or pressed sealing lip and metallic stiffening ring on the outer surface. Good sealing effect with bearing oils and greases. Extremely precise positioning in the housing or location hole. NBR 70 Shore A black -40 to +100 14

<0.5

      x     x        
Type HTS II PTFE rotary shaft seal with steel clamping ring on the rear side and self-retightening sealing lip. Design without radial spring with good dry running properties and low friction. Steel clamping ring does not come into contact with the medium. PTFE / Carbon   black -70 to +200 18 <6   x x           x x  
Type BSB Diaphragm rotary shaft seal including single lip seal with steel backing ring and support/dust lip for low friction and low wear. Also suitable for repairs as the old running-in track of the first seal is not used and therefore no reworking of the shaft is necessary. FKM 70 Shore A turquoise -30 to +220 40 <15   x x     x     x x  
Type SAB   Radial shaft seal with sharply cut or pressed sealing lip and metallic centering ring on the outside diameter. Design without radial spring for lower radial forces. NBR
FKM
      40 <15   x FKM version only x         x x  
Type DUO   Double lip seal to separate two media. Space-saving version available with coated metal cage or metal centering. NBR
FKM
        <0.5     FKM version only x   x x        
Type MHX 2000   PTFE rotary shaft seal including metal housing with clamped PTFE sealing lip. Self-tightening sealing lip without metal spring. Good dry running properties with low friction. PTFE / Carbon     -70 to +200 40 <1   x x     x x   x    
Cassette Seals   Cassette seals provide a higher protection among the range of the Radial Shaft Seals. By means of a labyrinth with a combination of some radial and axial sealing lips, the sealing performance on both inner and outer diameters produces the perfect and reliable isolation between the lubricant side and the harsh outer environment. The filled-in grease in the cavities of the labyrinth assure a much longer life time and a reduced drag torque. Combination of different materials acc. to application         <0.5 x Version with PTFE lip Version with FKM or PTFE lip only       x   x x  
COMBI Seal   COMBI seals integrate an excellent inner oil seal function with a strong outer protection from harsh environment. The use of a different material for the outer seal enhances the protection from the external pollution. Combination of different materials acc. to application         <0.5 x Version with PTFE lip Version with FKM or PTFE lip only     x x x x    
Sleeve   The shaft sleeve is a particularly economical solution to prevent wear on shafts and axles by contact seals. Running surfaces already damaged by run-in marks are successfully replaced by Speedy-Sleeve without any problems, within minutes and with simple hand movements. Stainless steel                 x     x        
End Cap   The end cap provides a perfect sealing protection for gear devices and gear boxes where the shaft doesn't pass through. Easy to install, it tolerates higher metal surface roughness and provides a radial static sealing with reliable tightness. It reduces the risk of corrosion and it compensates the resulting gap by the differential thermal expansion between the box case and its metal insert. NBR 70 Shore A black -40 to +100   <0.03       x     x        
V-Ring Type A Standard V-ring with short design and straight back. Can be mounted against stop. NBR 60 Shore A black -40 to +100 12 <0.2 x x   x              
V-Ring Type A Standard V-ring with short design and straight back. Can be mounted against stop. FKM 60 Shore A brown -20 to +150 12 <0.2 x x x x              
V-Ring Type S Standard V-ring with angled back for better spinning action. Long design and long bearing surface. NBR 60 Shore A black -40 to +100 12 <0.2 x x   x              
V-Ring Type S Standard V-ring with angled back for better spinning action. Long design and long bearing surface. FKM     -20 to +150 12 <0.2 x x x x              
V-Ring  Type L      Standard V-ring for larger diameters with short design and straight back for mounting against stop. Use in labyrinth sealing solutions. NBR 60 Shore A black -40 to +100 12 <0.2 x x   x              
        GAMMA form RB      Axial shaft seal with small installation width and mechanical protection of the sealing lip. The metal housing encloses the sealing lip. Installation with press fit on shaft. NBR 75 Shore A   -30 to +100 12 <0.2 x x   x x x x x x x  
   GAMMA form 9RB   Axial shaft seal with small installation width and mechanical protection of the sealing lip. The metal housing encloses the sealing lip. Installation with press fit on shaft. NBR     -30 to +100 12 <0.2 x x   x x x x x x x  

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