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Radial shaft seals HMS5 and HMSA10

Radial shaft seals HMS5 and HMSA10
Radial shaft seals HMS5 and HMSA10

Metric rubber outside diameter radial shaft seals, HMS5 and HMSA10, are designed to provide optimized performance under tough operating conditions, including considerable thermal expansion, high dynamic runout and shaft-to-bore misalignment. 

Designed in accordance with ISO 6194 and DIN 3760, they can be used in a wide range of applications within all industrial areas.

User benefits:

  • Improved sealing performance
  • Extended system service life
  • Withstands considerable dynamic runout and shaft-to-bore misalignment
  • Easy installation, reduced risk of spring-back
  • Additional exclusion ability without significantly increased torque and underlip temperature (HMSA10 seals)
Main features:
  • New optimized seal material
  • Spring-loaded sealing lip
  • Balanced sealing lip and flex section
  • Beaded outside diameter
  • Auxiliary lip (type HMSA10 only)

The rubber outside diameter provides optimized sealing ability in the housing, also at considerable surface roughness or in split housings. The beads provide improved sealing ability and retention in the bore. They also prevent spring back at installation. 

The sealing lip and flex section are balanced to withstand considerable dynamic runout and shaft-to-bore misalignment. 

The auxiliary lip on type HMSA10 is non-contacting, which means that the seal type normally can be used at the same speeds as the single-lip type HMS5, without significantly increasing torque and underlip temperature.

The nitrile rubber compound, SKF NBR 3243, is the result of long experience and the latest developments in seal material research at SKF. Advantages of this material include good resistance to ageing very good compatibility to synthetic oils very good pumping ability good wear resistance. 

Pumping ability is defined as the time it takes for the seal to return a certain amount of oil from the air side to the oil side. The microstructure of the SKF NBR 3243 compound results in that the seal rapidly pumps back the oil. 

The complete range of HMS5 and HMSA10 seals is also available on request in a fluoro rubber compound and with a stainless steel garter spring. This rubber compound has the designation suffix V and is used in applications where temperatures exceed the limits of nitrile rubber.

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